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getting stock heads is fine, if you p&p them and get some nice cams you'll make some really good HP. Im planning on doing the swap and more then likley with just stock heads since im low on cash and i need to fix my burning oil problem.
with the pi swap, ull be a hare faster than a stock 99-04. by the time u do that, just might as well have gotten some aftermarket heads and cams, and gotten more power out of em