I'm betting if you hooked up with IQ52, he'd probably be able to help you make some choices that would yield a 600hp B wedge with some scrupulous parts selection...apart from your intentions, I guess your budget is the overall limiting factor.
EDIT: just noticed you mentioned likely use of a 496 kit...that shouldn't have much issue making over 600 with well prepped heads...pretty sure he's accomplished that same number with as many cubes using ported 906 heads.