i have a 305 in an 88 vert that was converted by the previous owner from a tpi to carbed. after cleaning up the engine bay i removed the canister and plugged in the vacumn from the carb. i put a breather on the passenger side valve cover.

i recently discovered that oil is coming up through the dipstick tube and breather. how do i fix this?

 

you need a pcv valve on the opposite side valve cover that has a breather on it.