seriously though. . . . to save yourself a bunch of headache. just save up some money and buy yourself a 408ci stroker short block with maybe -12cc pistons, then buy plenty of good pieces used. . . like oilpan, intake and the like, spend another couple hundred on a cam and some ls2 heads, pull your factory engine out with low milage, and swap that one in a get it tuned. store the old engine! if you ever got rid of the truck, you could swap the old motor back in with a stock ecm, and then sell it. plus a good powerplant is the best place to start