1972 Plymouth 340 - 4 speed - 355 gear - Carburetor Suggestions

Best aftermarket carb for your combo is the Edel AVS2. It has small primaries with annular boosters that give great throttle response.
You already have the best carb on it: the TQ. If you don't know how to re-build/tune it, find somebody who knows.
I believe Woodruff Carbs specialises in them, somebody on here probably has his details.