Re: valve seats
I am not sure of the exact year, but there was a point in the 70's when all the manufacturers went to the hardened valve seats. The lead in the gas added a little lubricity and cushion for the valves. Without the lead, you can damage your valve seats if they are unhardened, or you can run a lead additive. I would recommend having the seats installed and save yourself a headache down the road. A $100 now is cheap insurance.
Cage Up, Wheels Down
All my Jeeps are in pieces! Except for one!!