Kent - Slow down and take a breath!!
It sounds like you are going in too many directions at once with this. I am speaking from experience so I don't mean this as bad mouthing!! Jets have little to do with the choke or idle circuit or transition off idle. Also if your temp is running 175 with a 160 stat you have a strong cooling system. you might see 180 temps with a 180 stat but as soon as the stat opens the temp will drop to 175 again. Anyway 175 or so should be imaterial to your problem.
The first thing you need to do is put the carb back to factory specs. Just like it came out of the box. Next decide what it's doing that it shouldn't. Match the problem to the circuit that the problem falls under. Here are the basics;
If the car is idling rich it's an Idle Ckt problem or a blown power valve. Of course the choke could come to play in all this as well. Get the car warm so the choke is out of the picture and dial in the idle. Sec butterflys properly adjusted, floats properly adjusted, accl pump properly adjusted then lean out the idle mixture screws until the engine starts to stumble and then back out just enough so the engine recovers. With a vacuum guage adjust for highest vacuum and then lean it out a little, about 1/8th turn max though. Adjust idle if needed. At this point I like to balance all the idle mixture screws so I check how far out each is and find an average between them and set to it. If you still idle rich look to a blown power valve.
When it idles to your satifaction warm go for a drive and see how it runs. If it stumbles work on the accl pump (squirters and cams) remember the bigger squiter opening just dumps more gas all at once and the cam changes the duration of the squirt. I can't stress enough to do this with a warm engine... Next you can mess with the choke and then start jetting for performance. One step at a time though.
I don't have a choke hooked up on my carb and find without it it two pump starts on the coldest of days and after holding it at 1500 - 1800 for 45 sec or so it will idle. Mind you I'm in CA and coldest to me ia about 45 degs. I can drive off without sputtering or farting but unless it's up to temp I can't blip the gas WOT without a bit of stumble. with the choke you should be able to have a rich enough idle to over come a cold stumble.
If you don't have a Holley book I recomend getting one and check out their tech info on the web. www.holley.com
It's a bit hard to find the tech stuff but look around you'll find it.
"The '69, the '96 our local club
and the "daily driver"