Update! The '73 I bought has been taken apart with no one who can verify why it the head was removed. All the bolts holding anything together have been lost! :-( All the headbolts, the 15 side cover bolts, the carb, rope starter bolts every bolt gone. Crazy was given a parts bag that was supposed to have all stuff in it. Guy I bought it from Dad delivered it to me as the son was out on a trip. I think I can get away with grade 5 bolts from hardware store.
This post is getting too long. After I get the '73 apart more I will start a new thread with pictures. Also building a new engine stand for it.