The only way I would touch a 69, -72 would be if it were a full new restoration to new project. Seems perty darn pricey to do that. The bikes may have a really high retail but the effort that must go into those must be extreme and costly. Gotta do it this way and that way and the nuts/bolts have to be in the right position and bla bla bla. Buying new parts or digging for new parts or making things that are right that you would not dream of on a daily driver and bla bla bla.
I personally commend those that that take that kind of project on. I started that with my XVZ12DN and man is that a tough project. Does it look good, sure, but do you ride it after that, prolly not. I do mine but it starts to take fun out of it because you end up cleaning more than riding.
if you are looking at mods or riding, I personally would do it on a 73 and later.
But then I am a newbie here so what would I know, lol.