gonna try again

my 70 340 dart leaves about a tablespoon or two of oil on top of the intake manfold. wheres this coming from? i did put new gaskets on the valve covers (cork) and didn't notice it for a while but that may not have anything to do with it. i'm learning as i go so i hope i don't sound stupid but is there a gasket on the distributor. oil on the intake i guess can only come from the valve covers or the dist if theres a gasket there. is this a simple repair. thanks