the whole engine rebuilding thing dont know to much about, but what i do know, dont order anything from online, most of the engines u order online are junk engines from japan and or other countries, sur they may look or sound lagite but its al bulls*** im tellin u a have a few friends who build their own hot-rods civics mustangs etc and if ur gonna get an engine u buy it in person and bring a mechanic with u, or u can just sell ur car and buy another, the economy pretty messd up u should find a great deal =), my cuzin bought an 06 g35 coup with 25k on it for 16 grand out the door. it was auto but hey 16 grand for a full oaded g35 2006, last year it would have easily gone for 20+