Forget about back pressure.
Inhale deeply, exhale through a straw. Now do 20 jumping jacks, and repeat. Continue until you die. Works same on engine. Forget back pressure.
TQ is a great carb, but not exactly for your stated goals. The small primaries will work wonderfully for/with a small short-period cam, but the secondaries are way overkill. I must confess tho. that I have made them run pretty good on stock-cammed teeners.
If you wanna roast the hides tho, a mechanical secondary carb is the way to go. But if you are gonna put skinnies back there, than a 2bbl will roast those.
