ok...Well with the dart pro 1 platinum heads with the next size smaller valves than the ones I wanted wanted Superchevy had a 383 make 512hp@5500 rpm.
http://www.superchevy.com/technical/.../photo_18.html
found the article online
http://www.superchevy.com/technical/...t_results.html
thats with a single plane intake and an of the shelf carb. I think 383s are more than easily capable of what I want. I think its more a matter of Its easier to build a high number motor with more cubes, and with the ability to get big block cubes in a small block package just seals the deal really.