This was the second motor I have built with solid roller lifters that had oil pressure problems, the first one was a 1966 Street Hemi block that the driver side oil galley was machined a little lower, closer to the camshaft, than the passenger side was and it would pulse the oil pressure when idling I ended up blocking that oil galley off in that motor to fix that problem in the car Don't we love Murphy
Engle use to offer their brand of solid roller lifters that had a longer skirt on the oil galley that helped a bunch on preventing this issue, my deal needed the pushrod oiling on this motor so no go on using the last set of those I have