Forgive me if I'm wrong, but what combo with a 80's 350 block gives you 427ci? Maybe with a new LS block. I'm gonna have to call bullshit.

With that light of a car and that gear in the back, there's no reason to aim for high torque (any smallblock is going to generate enough torque to make you happy). Go for the high RPM and fast throttle reponse. With that little weight on the car, it's just going to take off like a rocket anyway.

Punch the 4-bolt .030" over and run a 355ci engine. The 3.48" stroke'll lend itself well to high RPM, so twisting 9000rpm shouldn't be a problem. Make sure you've got the money in valve train and heads though.