I have a Little M 421 with T-1 CNC 227 heads, a Callies Magnum crank(3.875 Stroke) and Compstar rods. I have Diamond forged pistons and my CR is 14.3:1. It is a purpose built juice motor and dynoed naturally aspirated at 642 to 648HP( 10 pulls worst to best). Not street material unless you define it like I do,,,,,occasional short jaunts to get your blood pumping.
The crank is a work of art, and the imported Compstar rods machined in America are damn fine looking.
Yeah the T-1's and headers are a mild problem, but I get by with a set of Schoenfeld 1 7/8". Have to pull them to do about half the plugs, and there's 1 or 2 you can't ghet the wire on without loosening the header bolts. Also had to pull all the bolts from the drivers side header to do an oil filter until I remote mounted it. But that's due to a kickout pan. I have a set of 1 3/4 Dynomax headers that just flat won't work on the T1's. Hit #3 plug bigtime.
I had Mike Lewis flow 1 port on my heads while he was re-working them. And they flowed within a few feet of what Brodix website says, which iirc is 318 at .700
But on the dyno it was obvious heads was killing me, could not get over 735CFM into that engine with either my Race Demon 775RS(flows 935) or my 1050 Dom. It made the 648 on the Dom, but gosh it was all over on afr. The Race Demon is a superior all-round carb to my 8082 Dom. And as it worked out, the guy that owned the dyno knew my Dom from horse trades it had been through and his attitude was " oh yeah I know THAT Dom, it is BAD". End of day he was pretty impressed by my BG.
When I bought my heads 3 or 4 years ago I bought the BEST AVAILABLE that I knew of. If I had to do it all over again I would spend far more money and get what I now know is available and that is spec built heads from one of them bigboys like Larry Meaux. I would just call Mike Lewis and banter awhile and get some of them. All the poop has the new AFR's as damn good stuff, but I would be surprised if anything off the shelf would do within 10 or 20 HP of the T-1 CNC head.
I would also shoot the breeze with Mike Lewis on the pros/cons of a different degree engine than a 23°. Yeah, more money. That's a given. I mean stuff like availability, dependability, power increase vs cost etc.
But all things considered I was a bit let down by the power of a 14:1 engine compared to my previous engine which was an 11.3:1 flat topped pump-gas 412 sbc. Just not that much more there because you get limited by air flow on a 23° engine.
From threads here and other forums, I personally wouldn't touch the World block.
I bought my block from Carl Hinkson(CNCNE username) in Maine and his work is 2nd to none. I will give him an A+ for an immaculate block and I am very critical of cleanliness. He is damgood people and goes out of his way to help you. His # is 207-892-7215. It will go to his answering machine usually, but he always calls you back if you leave a message. The guy is a workaholic who almost never sleeps, and he gives a damn after the sale. He called me out of the blue about a year after the sale to see how things were going. Good guy.
Mike Lewis (wolfplace username at Team Chevelle) is who I got my rotating assembly from and he is in California, his # is 707-984-6103. He is damgood people too and will help you any way he can. I have called him on Saturdays, and emailed him on other projects and he is just always helpful. I have even called him to raz him about stuff on the forums.
Both these guys are super knowledgeable, and they worked together with me on my project. I asked them up front if they would collaborate together with the block on 1 coast and the guts on the other. They did great for me.
There is another guy I would talk to and that is Mark (Vortecpro). I've never dealt with him but he has a great reputation. If I ever delve into BBC's I will call him. He also does small blocks I know from 1 dude at the other TC, but I really can't recall Mark posting a lot on sbc's. He is in Colorado, and that would be just a little 8 hour ride for me if I bought pieces from him, then I could see his shop and dyno, maybe haul something up there and dyno it. My flat-topped 412 won't get out of my head
. I still have all those parts.