Fing oil leak.351/408 5.0efi

got an oil leak the pools on the back side of the engine block. thought it was out of the intake to block mating although i have now redone the intake gaskets 3 times. i took the pcv valve off and left it open air with a filter thinking it was building so much pressure and blowing out the block to intake seal on the back side..
what could be causing this.. please ask for any needed information and respond with ideas.............. :bang: for my mental health.
 
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