Just change the filter,disable the ignition,crank the engine until you see oil pressure on the gauge,reconnect ignition,and then cross your fingers and take it for a cruise.
You don't have a Milodon external system do you? I have seen more than one dual line system lose its prime after an oil change twocents

Gus beer

64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60