I'm ready to put the head on my 51 216 and have 3 different types of head gaskets and was wondering what would be the best to use. I have a copper one with a fiber core,a steel one with a fiber core, and just a fiber one with the steel rings around the pistons and water jackets. Anyone offer any opinions or suggestions? Also while I've got your attention, I've done plenty of valve lash settings on a hot engine,but what should the valves be set at on initial startup of a fresh motor? New stock solid cam and lifters. Should they be set a little looser than the usual hot settings?Thanks, Bob