yeah, you're looking at over a grand, probably closer to 2 grand into rebuilding the 318, just guessing, assuming it'd need bored, new pistons, rings, bearings, seals, gaskets and machine/tank work. thats not counting any head work that may need done. That's part of the reason i chose to just go big. It was gonna cost me the same to rebuild my /6 or the 318 i had as the 440 i went with. But if the 360 is running fine mechanically, i'd just detune it, much easier work.