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i was gonna mention the LS1 series, but it's been gone over nicely, but the other thing that would boost the crap out of millage would be changing the rear end gears more towards a 3.0 series, the stock 4's are kinda low, plus with the torque/power curve of the ls1 you could easily daily it with something like 3.23:1 or so....
oh and the top speed is yet to be had with one of these setups! 5th gear at rev. limit was 155 mph, with a 6th gear to go, and the 4.0:1 gears, imagine what the 3.0:1 would do haha
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