79 Volare

OK, I give up..
After three 2 bbl carbs this thing still runs like crap. I did away with the lean burn, new dist and V-reg and ECU and fuel pump. Still have the old choke thermost stuff on it.
The car runs perfect one day and the next day it dies at every stop light. I am thinking something in the carb is sticking now and then.soooooo
I have an Edelbrock SP2P and I have ordered the Eddie 1403 carb with ele choke.
Questions;
What temp stat should I put in?
I have heard no-gaskets on a alum intake, just silicone? I prefer both.
Will I need a different throttle assy?