What engine is in the car now and what do you consider "keeping up"?
If you have TPI, there are a lot of combos that can work nicely, a mild LT1 can put 300 to the wheels no problem, an LS1 swap would put you with in easy reach of 350 to the wheels and all can provide good driveability and mileage.
It is really just a matter of what you want to spend and what you want the end result to be.
-Tim
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