Intake leak question

87 318 from a w150, carb'd if it makes a difference. Have an oil leak from the back of the intake from what i can tell, it drips onto the bellhousing and passenger side of the block. only leaks when running, drips a couple of times right after shut off but that is it. I have a metal intake gasket, was doing some thread searching and came across one talking about an intake plenum gasket. Granted, that guy had a '92 magnum 318, just wondering if mine would have that aswell. TIA

** should have said this earlier but my plan was to go 4bbl with the factory alum 340 intake i have, just wanted to make sure i wasnt missing a gasket before i tear into it lol