I can add to what Jim Allen said. The high performance cars and truck engines that had valve failure was usually engines that had valve rotators. When lead was added to gas it would build up on the valve faces and they added rotators to keep the excess lead skimmed off but the lead residue also acted as a lube for the valve face and seat. When the lead was removed there was no more "Lube" and the valve face would wear into the seat and recess the valve into the head. The rotators will spin the valve stem and it sometimes keeps spinning as the valve closes causing it to scuff on the seat. Engines without rotators usually don't have ressesion problems but would get build up of lead when it was used and the lead would flake off causeing the gasses to burn the face. With no lead gas, the seat closes tight and has no build up to worry about as much. As far as octane goes, use the cheapest gas you can that doesn't cause "ping" and you will be fine.
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