If you rebuid you will have 0 miles on it... You will have to do the research yourself... I am facing the same thing rebuild or H22 or B16.... The rebuild will cost aprox to do it right as much as a H22... But then you can't do anything else to it.... But with the H22 you can get good reliable Hp with out doing a whole lot with it, but you are limited on how hp you can get out of it.... The B16 is mor expensive but can produce unreal Hp N/A, Turbo, or S/C... i have heard of some 600+hp turboed b16's... Its on a matter of how much money you want to spend and what your limits are gonna be after its finished... I know I am a newbie, but I had to go somewhere after all the people on the other forum lost there minds!!! lol