Big Valve X Heads on Low Comp 72 340

I can tell you that having a bone stock 72 340 4spd 323 peg leg Demon ( had factory T-quad), only had a set of Hooker super comps on it it ran great for a stocker..lol. when I went back to manifolds, it lost a lot of quick rpms, lost the torquey feel and generally felt like a dog . Headers are a super PITA putting in that A body, but the rewards are worth it in my opinion.
I agree with GTX John too, smaller valves create more velocity. Keep the 202s for when you want to add, pistons, cam, etc.