As I am doing my frame off restoration of my 66 GTO Clone I have been doing alot of research as to where I am going to end up with the drive train. Right now I am leaning towards a 455 with either 87 or 96cc big valve heads, an m20 muncie for the wide ratio, and 3.73 gears. Probably a 750 Holley and a decently big cam. I want it to be decently fast but still streetable on 93 octane. I am curious peoples opinion on this setup, and also what rear I should put in it. 10 or 12 bolt posi, or go with a 9inch set up.