classic case of the while i'm in there diease
I cast my vote for new rings and hone the jugs. To bad about the woodruff key, everything looks fine on the inside, let me clarify that, from the photos everything looks fine. I was going to suggest you put retaining tubes on the studs to keep the cylinders from moving when turning the crank but it looks like you got that. I rebuilt my 70t awhile back and the help I got here was priceless.