If your journal was worn out after only 80 miles I would check the oil pump especially as its a 66 engine.

The A65 oil pumps evolved over the years becoming better each time, see THis link for a history of the pump.

Hopefully you have one of the DD or iron pumps fitted, if not I would buy the SRM or new Hepolite pump.

Also worth reading the installation tips on the E&V engineering site Here. Ed suggests fitting the pump and spinning it over with a cordless drill attached to the tacho drive with a rubber pipe. With oil feed connected and pump spinning it should be possible to hear pressure build up and the OPRV blow off, there may be some leaks visible around the pump.

1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando