Alright guys, I've been trying to deal with this leak for weeks and I cannot figure it out. The leak is coming from the top of my motor in the back around the distributor. It doesn't leak while its running, only after I turn it off. It began as thinking it was a rear main seal but it's not. This is what I have replaced so far;
Oil pan gasket
distributor gasket
intake manifold gasket
oil sending unit
both valve cover gaskets

I'm running out of ideas... is there something I'm missing???

 

you sure its motor oil. transmission lines are the only other thing back there i can think of. my 1990 leaks back there too but pretty sure its the rear main, but aint messing with that til it gets worse as its maybe a drip a day.

sounds like you covered the bases on what could be leaking.... something stupid you can check, check your pcv valve, make sure that the hose going to it has a lot of vacuum. if that is clogged with crap it will blow out the rear of your intake as all that pressure has to go somewhere . learned that the hard way

 

There should be a small plug in the block just on the drivers side of the distributor on top behind the intake. That is where a lot of cars and trucks get their oil pressure readings. If your pressure sending unit is there that may be leaking. If not then the plug in there may be leaking.