Found my dads original 1971 duster!

moparker said
Not sure there is a gasket. Check dipstick tube. It may not be in correctly

moparker said
Yes. The way he said it seemed like he was told there was a gasket between the engine and trans. That was my first thought also. The pump.

Ya. I’m not sure what gasket they meant, but it’s a gasket that can apparently get pinched while putting the transmission into place, if you aren’t careful