I've gotten curious about Thermoquads and want to give one a try. I'm trying to find one that will run well on my engine (318 67 closed-chamber w Summit 6900) without any parts changing. I'd like to see if I get better throttle response and easier cruise tuning/economy than fidgeting with my AVS.

I've tried researching for my application, I'm a bit lost even with Vaanth's guide. With all of the different ones available on Fleabay and the like I'm really not sure what would be both a cheap & appropriate option for me. I know different years introduced different electronic emissions things that I probably don't want, but some earlier year carbs miss out on improvements done sometime in the 70s. Apparently some but not all later-70s carbs have a limiter or cap on the metering tree adjuster which kind of defeats one of my goals, etc.

What should I be setting my sights on?