I went for the 408... build a stout bottom end and solid driveline and THEN put a turbo kit to it
JMO...
I would've said "get a nitrous kit," but that's already been addressed
Whatever you choose... having power and being able to put that power to the pavement are two different scenarios, keep in mind... the guy that makes X amount of HP more than the next guy who has a solid combo, doesn't always make it to the end of the track first (or to the next stoplight)
I'd address the trans., driveshaft, suspension, and rear end.... before putting more power to it than the car can handle