What seal leaks first on an overfull 350?
Your bud is a moron. Why would he do something so stupid.
Overfilling by one quart should not really cause anything to leak if all your, oops, I mean his gaskets are new and properly installed. What he might run into is some more oil than normal being whipped around the inside of the crankcase. This could make an poor gasket or seal show itself more readily. Tell your bud to pull his head out and take a breath.
Octane, lead subsitute for the 230?
Brianna: probably the mains. I still say your damper and seal aren't in sync. Otherwise, it wouldn't be leaking there....