oil filler cap

Tommy
Slants are pretty bulit proof. Dont add anything yet I dont think you need to.
I believe it just needs to be run. Alot of slants that sit need to be run awhile before further evaluation. What you have discribed about the smoke on startup and now none is very common on an engine that has sat. Ive run engines for years without replacing anything (except consumables & normal maint items).
What ever you do dont turn your carb in for a reman (they are most likely going to be junk) rebuild it your self or take it to a shop that rebuilds them.
Pm me if you need more info.
Frank