Best Weber Progressive 2 barrel

You've pretty much outlined what I want.......sans for the Weber. Obviously, what I want taint happenin. No surprise there. I am "thinkin" with all the mods mentioned, a 500 Holley 2 barrel won't be too big. Or at the very least will be tuneable. Maybe the 318 BBD as well. I actually have one of those.......somewhere.
Have you ever used the 390 Holley?