Cranky,
I think it would have a lot more to do with the type of work the motor is doing than the sheer number of revolutions. With my limited mechanical knowledge, I'd say it'd probably be the road racer (assuming all three motors are identical). The dragster will have 5 "balls to the wall" runs under maximum load. But how many times during a typical road course do you have your foot to the floor climbing through the gears? Then how about downshifting? Then back up through the revs...then back down.....on and on. Gotta be hard on the motor.
The street engine would cruise like that for years. Well....until someone convinced them to put it on the track and blow it up.
Steve