Engine Brainstorming

I'm not sure you could get a whole point of compression by shaving the heads. I'm not that technical savvy though.
As far as Demon carb's, I run a 650 Speed Demon. That would have about the same flow as a 720 Holley as they are measured differently. I am very happy with mine. You need a vacumn guage to set them up properly, but once you get it done, they work great.

Jack