Thanks for the good info, Mark!
If I decided to build a new 360-based engine using a Magnum block, I'd try to sleeve all 8 cylinders for better ring seal and not worry about the rest of the engine breaking up, as it won't ever make much over 600 hp with the tune I'll put on it.
It would be a 4" stroker with low boost (6-7 pounds) to give trouble-free power from 93 octane gas. Minimal boost will hopefully preclude detonation and the attendant head gasket failures.
Should run good on the street in a 3400-pound car.
Bill