Help me select a cam please

first off ,was the engine used in circle track racing? if not, why are the left side tappet bores bushed and not the right? are they out of tolerance? maybe you should pop out the inserts and check tolerances.this engine could have been poorly rigged as a circle track car and instead of blocking off the lifter galley the right way the guy may have just used the inserts.I would definitely check the tolerances out on both sides for proper tolerances. If not imo you will need to use a solid with thru the pushrod oiling and rely on the rocker shafts to oil your tappet bores properly, thats very strange setup you have for sure. I would just run the M.P. 528 mechanical .the oilpump dictates the pressure. the thru the rocker type pushrod oiling may provide adequate oil to the lifter bores but its iffy and may drop your oil pressure and decrease life of the valve train and the guides. sounds like a circle track car restrictor done on the cheap .