Like I used to tell my high school students- - - - -"Make it stop and steer before you make it go fast". Those heavy duty drive axle were never intended to run the speeds you're proposing, so even if you do manage to modify the 302 for the RPM capability you're considering, the drive train will either hand grenade itself or wear out parts that can never be replaced. Good luck- - - - -you're going to need it.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!