A C5 or C6 can easily get in the low 30s as they sit with just reasonable driving.
'Vettes are fairly light and have fairly good aerodynamics. 6 speed 'C5 and C6 'Vettes have a nearly optimal drive train.
Too bad the GM 4.5 liter V-8 diesel was lost in theGM holocaust. Best option available today might be a Cummins 4BT3.9. A bit heavy (about the same as a 454 gas engine) but very efficient. It might be too tall to fit in the engine bay without a bulged hood.
The little Cummins should easily put a 'Vette into the 40s.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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