1980 Ford E-250 Base

Selling my camper van. Engine runs strong tranny shifts nicely and it passes emissions good. Was a project to build out into a camper van got most of the way finished unfortunately there's a small oil leak I can't figure out. Change the fuel cover gaskets check the oil pan gaskets plugs and filter all seem fine. I put all new boots and spark plugs same with a whole new front end I've on the vehicle for 2 years and I've always kept up on maintenance new serpentine belt as well AC does not work.