Before I ever read Larry 0071's post, I was thinking exactly what he said in his very first statment. You proberly scratched the cam bearings when you installed the new cam. It sounds like this is not a fresh rebuild on this motor and this is not an easy fix. How cold is it where You are ? You could increase the viscosity of your oil( go to a heavier weight) and it may help some. With the motor you have you're not going to be turning too may RPM's so I think Your application and Larry"s are two different things. In your case I think putting in a high volume pump might help. It doesn't take a lot of oil pressure for that motor at idle,So If You have 30 or so pounds,say at 3000 rpm's on the highway you should be OK until You're ready to do that total engine job. JUST MY OPINION, BUT I've been there. Did the same thing years ago and I ran the fool out of it with no problems.Don't know what your results will be.Good luck!