Oil pan gasket trouble 1989 jeep cherokee laredo 4.0L rear oil leaks?

have done in cradle rebuild on my motor, replaced rear main seal, new oil pump, new oil pan, ( five different rubberized fel-pro oil pan gaskets) replaced seal in oil filter adapter, new timing chain and gears, water pump, new thermostat housing and thermostat, new motor mounts, all new block sensors for cooling system, map sensor, new intake -exhaust manifold gasket, new o2 sensor, new injector seals, new push rods, rocker arms, pivots, springs, valve stems, polished inside of valve cover, new valve cover gasket, aftermarket transmission cooler, made new power steering pump lines, rebuilt power steering unit, rebuilt distributor, alternator, starter, have this situation where the rear oil pan gasket seal keeps leaking excessively after about one to two minutes of startup. To insure that I have not improperly installed or damaged any of the previous oil pan gaskets, I have unbolted the front shocks-unbolted the sway arm supports and removed the two top front bolts that hold the axel in place to the two upper pivot arms. To no avail I still have excessive leaks rear drivers side of block, have re stabbed the distributor-repositioned the oil pump guide-checked the timing mark for alignment would greatly appreciate any assistance (is there a possibility that the new oil pump could be defective blowing out the gasket where there is possible manufacturing defect in the rubberized fel pro gasket)