Yank the 427 Chevy. It's too small.
Look on some of the hardcore racing BB's for something like a 615 or 638 Chevy. Either of these can be had, freshened, for a lot less than an all-aftermarket Pontiac-based engine. And you won't be wheezing through small block Chevy-sized intake ports like a Pontiac, either.
You'll need either a Chevy-pattern TH400, or an old-style Lenco 4 speed.
That should just about do it.
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