69 340 having oiing issues

like airwoofer said, rare-but some blocks came from factory with oversize diameter lifters, and front of block driver side near top was stamped with a symbol. I saw 1, a 1963 413 with 8 oversize lifters. but if this was the case, or if the plug at the rear of the driver side galley was out, oil pressure would be very low. and since u are getting oil up thru the 2 pedestals, I think cam bearings are okay. and oil flow up top will be more when oil is hot. in and out of a body shop all summer killed it, common problem