turbo or nitrous?? what's the weight? It would be easier with a turbo. a higher compression 370-408 would do it on a 88mm or so turbo with a 245cc or larger head, thats considering the block has larger diameter head studs, etc..., the stock 4 head bolt blocks can handle 1200 or so rwhp with a spot on tune
a nitrous motor would need to be larger, more in the 420-460" range, on a 6 head bolt block (LSX block, ERL Superdeck, or a RHS Block), and a good bit of compression, with not too much gas on top should get you there.
most of the nitrous guys in the 4's are running canted valve mozez headed 6 bolt blocks with a good bit of spray or a 88-9x turbo.
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