New Carb

I went with the Edelbrock 650 AVS2 and it was super simple setup and hasn't required any further tuning. Excellent idle quality and throttle response. That Street Demon was in my shopping cart a couple times too. Really a coin flip situation. Unless you know what you are doing an old Thermoquad could be problematic. Great carbs, but most anything used you buy is going to need to be rebuilt and there aren't many tuning parts available. Guys are having to salvage old cores for parts to modify to tune with. Doesn't seem like where you want to be.