I am in the middle of a rebuilding a 304 out my cj5. I have lots of questions about the machine work po did. First what head gasket would you put on this motor. There was no head gasket before maybe homemade but not your regular gasket. Next is I can not tell if the block is supposed to have small non casting marks (notches)to clearence the rods at the crank. And last the cylinders have a 1/4 brass ring or some other metal ring at top where your ridge ring carbon would be. Does this sound like the po built up a nice hp engine. I guess the machine shop may be able to tell me more tomorrow as it goes in for minor work. Thanks DD