Agree, sounds like valve guide/seal issue with that restart symptom.
I'll assume it's not fat-rich, washing the walls & screwing the ring seal.
Mine had the stock PCV setup, and it was never an issue.
Before its rebuild, it'd trail oil smoke from the tailpipes; it was tired but still strong.
It didn't have those seals TJP linked, just the regular O-ring deal on the tubes.
While oil would get onto the threads when removing spark plugs, the motor used very little oil; nothing measurable in 100 miles.
It initially (post-rebuild) had some oil usage that was through the guides (mostly showed up on spark plugs), fixed it with the Silver Seal seals I mentioned way back on this thread.

FWIW, I had a rule that every time out, at some point it would see WOT and 6500-7000 RPM, and I never lugged it.
My point being, I didn't baby it once it was warmed up (not saying that's the problem with Bill's issue).

Also, be careful with intake-bolt torque; dinky little fasteners...