I am considering buying a 99 GT engine with 80k miles on it. The asking price is $900. I would have to drive probably five hours to get it, so probably another $200 in gas. If I dont do this then I would probably get a PI kit for $400 used with 40k miles on it and a much closer drive, about an hour. I feel the engine may be easier to instal instead of the heads cams and intake. Also how much do you think my engine I have now is worth 96 GT 4.6 non PI with 118,000 miles on it?