carb replacement suggestions

Summit thermoquad (holley rebuilt) looked like it fell out of a truck at 50 mph. That was my experience when we bought one. Then I had to plead with Summit to return it. It worked like shi# and leaked fuel into the intake.
I bought an 800 avs thunder edelbrock for our 440 and it has worked flawlessly for 5 years. If you want a trouble free bolt on plug and play, I'd get a new edelbrock avs in the cfm that was appropriate for your build.

Rusty can rebuild your TQ for you, I think he does or did rebuilds for people. Might be a more economical option than a new carb.

Oh, I see you got a demon. Well, how about post some pics and feedback on how you like it then?