I've been down this road twice now...
First version
00 LS1 Texas speed 233/239 cam kit. ARP rod bolts and 1 5/8 long tube headers. Th400 trans with 3200 stall conv. and a 9" with 3.25 gears. Car ran 11.95@114 and got 20mpg. Driveabilty was still great even for a driver.
Second version
07 6.0 L92 heads texas speed 229/236 cam kit. 1 7/8 headers ARP rod bolts. T56 6 speed 3.89 gears. Drove the car 650 mile round trip and got 24.2 mpg on the way home running 85-90.
All your driveabilty will all be in the tune. The parts are a lil more expensive but the power gains are worth it.
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