FYI only...I used to work at an outfit that sold distributors. They had a run of GM distributors that were sent out with undersized journals "at the base of the housing". The two journals should be tight enough to seal the oil galleries in the block but still drop in and turn.
If they are undersized the oil leaks past the journals resulting in reduced oil pressure throughout the entire gallery. In some cases the pressure was so low that the customer lost bearings.
I mention this in case you installed a different distributor OR polished the heck out of the journals. Some guys think polishing the distributor is a good thing...which it isn't.
Sorry can't remember the "go/no go" journal diameter.