I'm with red58. My experience with early engines is the hype about burning valves & damaging valve seats is just that - hype. I've put tons of miles on pre unleaded engines and have never had a problem. I put over 100K on a pre unleaded 235 and over 50K on a pre unleaded Harley using unleaded gas without problems. I'm working on my 38 now without putting in hardened seats & valves.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.