Based upon those facts and circumstances, I would set my goal on getting a LS7 crate motor. Chevy just announced its availability. With 500 hp box stock, there is NO telling what headers, free flow intake, minor tuning, and a few over the counter goodies could do to that mother hugger.
Remember, your trans really needs to be a 98 or newer designed with the two piece case (bellhousing comes off like a stick shift). The distance from the flywheel to the converter face is different on the Gen III and Gen I/II. You can make a 4L80E from a early model (1995 ect.) fit a Gen III, but you will have to space the converter and you will not be able to bolt the bellhousing all the way to the oil pan as the Gen III is designed. This is how they put Turbo 400 transmissions behind Gen IIIs for drag racing applications.
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