I had a similar problem years ago and a local engine builder pointed out a threaded hole in the cam cover end of the pinion shaft. He said that, while it's the oil passage to the pinion bearing & crank pin, their is already more than enough oil splashing around the lower end to provide oil there. He put a screw in it and promised me it would be ok and give me more oil pressure to the top end. It's been over 10yrs & 100K and he has been spot on so far. I ran an oil pressure gage off a custom front rocker adapter for a long time and had a min. 5lbs oil pressure. I would check with some engine builders to see what they think. It worked for me but I'd hate to see someone else tear up an engine by trieing this...