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Message: <blockquote data-quote="NXcoupe" data-source="post: 623465" data-attributes="member: 11751">No, and why rebuild a low milage engine? How low of milage is it? I have used these engines out of the truck and swap cam and timing set, put MAC P headers on the P headed ones, and swap throttle bodies and go with it. We had one on the dyno and with a stock cam it made 300 rwhp. NO CRAP. Of course it had long tube headers, cai, mass air, injectors, throttle body and spacer eliminator and a true cobra intake, but I about fell down when I saw it. He is on a board called StangBangerz.com based out of Cincinnati. His name is Kurt. He can tell you his setup better than I can. I just helped him tune it a little and ran the dyno. I was a believer after that.  Just swap cams and go with it. Is it for sure a GT40 engine, or is it the P heads? Either way they are both good. Kurt had the P motor, we've gotten more power out of the P than the std gt40's for some reason, think it's the smaller combustion chamber on the P's that helps it out more.</blockquote>