Well 408 stroker turbo for an LS1 fbody would run close to about 20 thousand and tranny rebuild and rearend. That would be about 1000rwhp+
Just to get to 600rwhp would be 8 thousand for just a tubro kit and stuff need to handle it.
Those are just guesses from what ive seen on LS1 tech but that w/o nitrous.
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1998 Trans-Am
H/C/I/E/Gears 448/422
(Turbo Lag - Turbo Power) + Hype = VTEC
"VTEC, all of the lag and none of the turbo. It's like waiting for bad sex."