650 or 750 cfm. carb??

Im just repeatitng what was told by reputable builders to me! Guy that built my 340 said about my Speed Demon "Get rid of IT". Fella from Engine shop Told me the "FUEL curve Is Horrible on them, make same top end power on Dyno as A HOLLEY but the way up is where the fall short" Which really doesn't matter If your If like me and not a big time Racer. But did find My car ran better with the Holley. I had a 650 Holley Before the 650 Demon, then went to a 750 Bigs Holley glad I did. Just my experience and what Ive been told. To bad just sold My Speed Demon for $200.00 on kigijii few months ago, D