Thanks for the input guys. About the engine, i am getting a killer deal, because i work at a body shop (and i'm still in HS, so funds are limited), and another sentra was totaled, so my boss is basically letting me have the car as a parts car, all i have to do is pay to get it legally mine. My car is my daily driver, so right now the only time i get to drive is when i can drive my dad's 350z. So it is pretty definite that i am gonna use the 145k motor, just because of urgency and money. I just need to know common and probably obvious problems about this engine so i can save time and money by fixing it b4 i drop it in mine. Thanks again