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My car currently has 730hp and runs 10's. Car feels really slow to me now.
Thinking about really stepping it up to bring back the fun. Thinking big turbo motor.

730hp @ 3500# should be well into the 9s. I'd square away the car with the current engine before I'd make a big jump.

Although, twins on a bigblock will certainly get rid of the "feels really slow" issue.