750 speed demon

Oh ok l see.with that cam it says need to use at least a 750 carb.the engine is in a 72 plymouth duster

That carb will be fine. Don’t let the other brand fan boys scare you off. The last thing need is a carterbrock and tuning a TQ with a cam like that is a PITA. I’ve learned a ton just reading through the tuning threads on this forum. Mattax has some very good posts with great links to read through. Spend your time doing a search for those and use that carb. You’ll be fine