390 w/open chamber heads

Moper,

although he would have improvement with, let's say the RPM mentioned, wouldn't it show itself higher in the curve? Which, if he's just wanting something to about 5500, would it show up with any significance from that number down with the RPM?
Not trying to throw a wrench in anything, learning myself here, lol.

I could get a really really good deal on an M1, like $75-$100, and thought about snagging it for my 318 and upping the cam in it but I know it would kill what low end I have....especially running the small valve 2bbl heads. :) Maybe it's just that I really like how the M1 looks, lol :)