408 stroker head gasket recommendation

I’m not sure what you can get away with on 91 octane. I don’t have 91 available to me, just 87,89 & 93
Cometic head gaskets are a custom order size. Get what you need. While a quench is good and tighter is better, the octane limits are more concern before I recommend anything.

I’ve been told and read that the quench area greater than .050 is not any good.

I have run both pushrod oiling and shaft oiling at the same time to no ill effects. However, as said…. You can run the Magnum head gasket which blocks the oil, rotate the bearings, which blocks the oil or go to a solid pushrod and leave the stock oiling alone.

You pick one or both, this is your call and have been dully well informed.