Carb Advice Appreciated

I love TQs but with your situation, a used one may not be the best choice.

I would use the Edel 650 AVS. It has the adjustable air valve on the secondaries & annular primary boosters which give superb throttle response. The primaries are smaller than the secs, for better mileage & response.
Holleys [ & clones ] are best use for door stops....