Which Carb to choose for my 225 Slant Six

When I had the slant in my Barracuda I tried a 600 that I had and it was way to much carb for what I had. My engine had increased compression (~9:1), a cam, headers and dual exhaust. Anyway I went with a 390 and it was perfect. Great throttle response and would run strong (well strong for a \6) to 5000+ rpm.