all different. All I know about your question is unless you are a darn good technician it proabably isn't worth it. I would only do it to a convertible. I seem to recall some controversy about ATK engines but if you click search on the left you will find hours worth of reading on the subject and some people who have done it.
L.A.N.C.E.: Lifeform Assembled for Nocturnal Calculation and Exploration "What a beautiful life this could be; if I could just get it right" Vallejo