Drivetrain:

This is a dream car of course, so it needs to have somethin big and nasty under the hood. A 440 or 426 might fit the bill. Or with the AAR hood, how about a light weight small block for tearing up the road course.

Chassis:
The person I drew this for would be old school, but that could easily be combined with some new school goodies for the right ride height and handling.
Wheels & Tires:
Cragars, and nothing else. They make the bigger sizes in the old style so it's a perfect fit.
Body:
black, plain and simple.
Interior:
If I was building it, all custom.