I have my body ( actually the car's I mean) up on a rotisserie and preparing to install my conncectors. I lined up the subframe using the aligment holes and marked on the bottom of the floor where they end so as to know where to line up the connectors. The concern I have is that when I purchased this car it was in pieces and looks as though the fenders may have never even been on this car. Question is am I taking a big chance by cutting and welding these in place without the subframe in place? And what about fender to door fitting etc...needless to say if I weld this baby in am I really reducing any possiblity of tweaking the position of the SF for body panel alignment? Are those alignment holes hard and fast positions or just ballpark places to begin aligning with?:confused:

I would wait. I've used the alignment pins for the subs on 4 different camaros. 1 was right on, 1 was real close, the other 2 needed to be moved away from pin alignment to get the clip & motors to line up right. In my opinion, the alignment holes are ballpark. I've just noticed differences in cars. Not all are the same. For whatever reason, body twisting from too much motor, wrecks, maybe the subframe not perfectly square for whatever reason. Too many kegger parties on dirt roads in the mountains. (I have one of those cars, sub-frame banged up pretty good on the bottom.)
If the car came with fenders off a different car, that would make me think it may have been hit before. I have 3 sub-frames right now that look good sitting there, but they are tweaked. Look at your frame closely. I had 1 where the right frame rail was rolled in 1/4" from a hit. Couldn't see it, but you couldn't get both motor mount bolts in either.

I wouldn't weld them in place without pre-fitting, but that's me.

I am in the same situtauion as you are. I have my car back together for fitment but I am going to wait till after I set the motor and trans in before I weld in my subframe connectors. That way the car will have settled with all the weight.

Do you guys think I could at least weld in the back portion into the floor and rear frame rail and just leave the front portion disconnected? I would sure like to at least get the floor welding done so I can paint the underside of the car while up on the rotisserie. The front connector pieces leave some back and forth ability prior to welding it is the side to side stuff that wouldn't have much room for error if I weld into the floor.

Do you guys think I could at least weld in the back portion into the floor and rear frame rail and just leave the front portion disconnected? I would sure like to at least get the floor welding done so I can paint the underside of the car while up on the rotisserie. The front connector pieces leave some back and forth ability prior to welding it is the side to side stuff that wouldn't have much room for error if I weld into the floor.

Thats exactly what I have done and as long as your close with the left to right placement you will be fine. As far as front to back DSE recommends a little space anyway (I forget the measurement) due to the small plates that you weld to connectors and then to the subframe for the connection. That allows you some adjustment front to back.
Since I did this the car is back on the ground with the subframe roughed in and everything looks fine as far as fit of the connectors. Hope this helps.

I would definitely measure the frame thoroughly and make sure its not bent etc, theres some measurements on my site that may help. I made my connectors but theyre very similar to the ones youre using I think. I penetrated the floor and welded them the full length etc, and it was also on the rotisserie. Naturally, I did it the hard way and suddenly realized a much easier way just as I was finishing up lol. I left exactly zero tolerance for error and couldve easily bolted the frame on BEFORE I welded them in but thatd been too easy I guess :o Anyways, my point is if ya wanna bolt the frame on while its upside-down on the rotisserie, you can support the front just above the cowl so that that part of the rotisserie can be taken outta the way, if that makes sense.

At most I would only tack them in place... easier to move if needed. Try not to get ahead of yourself on welded in items.

Or get ones like mine. They were pure bolt-in, even at the subframe. But within 30 seconds of driving after installation I had my buddie weld them up. I've never understood why some of these connectors require the floor to be cut-up. If memory serves, mine are from CE via Summit. I checked my stuff for a picture but no luck. I'll take one if you want.:)

I cut mine in for several reasons. It keeps them from being seen from the side and allows more clearance, and they also are much more integral being welded the full length into the floor ;)

Call DSE. They've done hundreds of them and have GREAT customer service.

I'll be doing mine pretty soon, so glad to see all the replies to your question.

Good Luck!

I welded mine in without the sub-frame and had zero problems. There is a little space in the front anyway so front and back is no issue. I took diagonal measurements from the sub frame connector back to a reference point on the frame. Having said that I agree that the best thing to do is call DSE if you have any concerns they are great.