383 intake / carb help for my 73 Dart

Gotcha. Well, being that you know it needs a carb rebuild, that would certainly make a large impact on the drivability.

A thorough tune up (cap, rotor, plugs, wires, fuel and air filter, timing verification, etc.) would likely go a long way to helping you out. Also, recommend doing a compression check, read your plugs, etc. Are there any abnormal noises, leaks, smoking?

Diagnose where you're at first, and then from there you'll be able to more accurately guide your direction.