I am getting a turbo kit for my daily with an LS3 and half of the hot side is a factory cast steel manifold with a custom made "log" manifold on the other-side of the engine. They're connected with a custom piece with a bellow joint for flex. With an S480 turbo, this kit is rated to 800hp. Yes, 800hp. Looking at these standard cast manifolds, they are very similar to Pontiac ones of the day. There is nothing stopping you from making a kit using standard Pontiac manifolds IMO and making similar power on similar boost (~14psi) with a similar turbo. If you've only got a 2bolt block, the block would be the weak point IMO if you were to CONSTANTLY abuse it. Pontiac cranks are not light! But keep it at about 700hp with studs and it should last a long time.
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120
'66 Pontiac GTO - 389, 4 speed street cruiser
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