Closer examination on an E21 head with front cover removed shows an internal cross rib is hitting the oil sprayer bar at the front- with no gasket. That one is casting number 11802600069, no date stamp.
A spare valve cover stamped 1180260080.9 date 69 has lower ribs so it clears with no gasket. I'd never noticed this before with the odd cover - ran it for years. On the 121 head on the motor now, with good even transition from head to front cover, I was getting oil mist coming out the front, with correct torque. So it wasn't sitting evenly on the gasket. Or maybe the newer gaskets are thinner? Very odd - I suspect the odd one is either the original (circa 66) or from a 1600. But aren't the valve train setups the same?