Get a piston with a 2.060" or taller compression height, comp xe275hl cam, 440source stealth heads, performer rpm or holley sd intake and a set of headers and you're there. Camaro Craft did basically that build a number of years back and got some good power out of it.

http://www.carcraft.com/techarticles/116_0111_535hp_440_engine/index.html

http://www.carcraft.com/techarticles/116_0205_mopar_440_update/index.html