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The seal is above the plane of the pan, contained in the saddle that holds the rear main bearing as well. Most of the problems with rear mains in the F-134 seems to come from undersize/worn crankshaft seal surfaces and some poorly made lip type seals.

This is very much a circumstance where I'd like to be proven wrong. Where it's a simple fix. Good luck , Rodmayo.

You have a bigger problem than a stuck crankcase vent system. Oil puking out the bellhousing is usually a rear main seal. I forget if there's any lube passages or plugs back there, but you need to address that issue before driving it much more.