How about the new ATP turbo GT30r none rotated? I would venture to guess the GT3071 would make a nice little track turbo. We run the GT30r on our low compression motor and running 104 octane gas have it set at 420whp on it's full tilt map (the car can make more than this 30-40whp more but it's dialled back to last)
Personally given your setup and goals I would run either the rotated GT3076 with a .82 or the none rotated GT3071 .82 (ATP turbo) and clock the intake manifold and have someone shorten your IC piping, instant better throttle response and a significant gain in spool up.
Mike
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