This should be over in the tech section so you can get more responses.
So are you saying you now have the matched bulltear gears in now. If so, throw in the dist and see how it meshes. I would use a lot of assembly lube on all of those parts. I installed the npt type oiler on mine as well as the valley oiler to the rear main bearing.
Take apart and r/r your oil pump. It could be binding.
89 Grandwagoneer, built 360, COMP cam set, port matched Edelbrock SP2P, 475 cfm Holley ORA, Thorleys, MSD6a, extra cooling and oiling.
76 Cherokee S Chief - rebuilt stock, Holley, Performer, MSD Dizzy.
89 GW parts waggy