I have the S&S oil pump on my 48 model( going to put one on the 65 too ) and have had the oiling system changed to the late type Shovel oiling system ( for better oiling to the Hyd. lifters and upper end and I am running solids ), which I believe your instructions with the S&S pump give you ( you can go to S&S web sight to view them ). I have restrictors in the passages to the upper end , in the case where the cyl. and case meet( don't know if they are factory or some one added them ) . I was told that in Knucks and early Pans you could ( thats could ) feed too much oil to the upper end, I was told to leave them there . I'm not saying to do that , a lot of Pans are running late mod. & S&S pumps with no problems and not restricting any thing .Some say the OEM pumps are adequate and that may be true to some extent and if every thing is working to spec's ,the are, but why not bring the oiling system into the twenty first century , its nice to see oil pressure period. The more flow you have will of course have a higher oil pressure signature , more flow means better lubrication and a cooler running motor, the bearing skating is much debated , here and else where , there are a lot of factors that have to happen for the skating to occur, IMO. Some just see any thing not OEM , is bad for the motor .You will no doubt hear for others here , I hope !