650 or 750 Edelbrock on 340

I'll admit I have very little experience with carburetors, but I do remember years ago that a guy who raced at MAR, had a '68 roadrunner with a warmed up 383, he had a Holley 1050 dominator on it and it was pretty much a dog off the line. I heard him complaining about how poorly his car was running and I said get rid of that wash tub carburetor and single plane intake, and use anthing other than those champion plugs and go with a 750 dp and a good dual plane intake manifold. He did just that and his cars performance greatly improved.