you need to be making at least 255rwhp for a 5 speed and 240 for an auto. Those are representative of 15 and 20% driveline losses to 300bhp.
I made 244rwhp with just exhaust and a TB&CAI s 300bhp isn't out of the question with bolt ons. 300rwhp requires a substantial investment with P&P heads and new cams and springs. At that point you're trying to get over 355bhp from a 281cid motor... not the easiest thing to do.
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