I know several Mopar sponsored NHRA SS class racers that raced 383 back in the late 1970 and early 1980s, they where shifting them at or above 8400 RPM back then with that technology back then pushing the NHRA rules to the limit
On your deal how long do you get to push the race car before letting out the clutch ?
The reason I'm asking is the cam and getting the motor up to RPM that it will start to pull good before wind resistance gets in the mix