I think Reg would have told you to remove the distributor and using an old dist with the gear removed and a cordless drill turning anti clockwise , pump up
oil pressure without cranking the engine ( assuming this is a wet sump motor ). Yes its a little bit of work, but sfa compared to rebuilding due to premature bearing wear!
If you simply remove the distributor and crank the engine over you will never get
oil pressure as the distributor drives the
oil pump!
Jac Mac