like I said, I would try to limit it to 600hp on a stock gm block. Maybe 650 but that is about it. This goes for a 355 or a 434.
get to 600hp with any combo of engine hp + no2: 300hp build with a 300 shot to a 500hp build with a 100 shot. your choice.
A mild 300hp build will have better street manors but will not be fast without n02.