Help Have 1969 F100 with 240 motor inline 6 cyl leaking oil below distributor at a hole on block.Pulled distributor and o ring is ok. Hole is below the o ring and on housing that distributor fits into. The motor has a lot of blow-by.Don't know if this would push the oil out of the hole.Thanks

 

If the PCV system is blocked or not functioning it could allow crankcase pressure to build up and contribute to the problem.