750 Holley or Proform?

I found and purchased an original style timing tab off ebay and im waiting for it to be delivered so I can set the timing where it should be. I just really feel it needs a carb more for performance, and I feel that a 750 will be just right. has anyone ran the demon carbs at all? they look great but I'd much rather have a great performing carb then just a carb that looks great. Thanks -Kory