Hey OP, I am about to go pretty much exactly are you listed (Soon...lol when plastic allows)

Why not add a 160 t-stat, since you will need to get tuned anyway?

 

Good plan you've put together.

Good call on the poly motor mounts...I'm kicking myself for not taking care of that when I have the chance. Getting tired of them rubbing on tight turns, etc. so I'll definitely need to go back in to change them.

 

Yeah, it's not cheap! But because I read up on it, and this idea seems logical, but running an engine on a cooler temperature isn't necessarily better (performance/efficiency). Meaning... the only part you really want cool is the incoming air temperature. When it comes to the motor, you want that relatively warm(>160 deg). Before a 160 deg thermostat, I'd getter a better radiator. Just my .02!

Thank you sir. Trying to do everything once and right to this car. Not too excited about poly's, but I don't wanna complain about rubs

 

Agreed. I got my LT1 Radiator for 100 bucks brand new at Advance. I found a small crack in my LS1 rad, and I was installing the Chrs1313 RA at the time, so best of both. I live in southern Louisiana and still run a stock T-Stat, with no plans to change.

They won't be bad if you take your time and keep a clear head. If you can get a jack under the oil pan and get it good and balanced, you can move the motor around under the car with one hand. Best of luck to you.