You need to check the valve seal to the lowest part of the valve train, the valve keepers and or retainer without the spring under them scope wrench
Make sure to have it fixed if it is less than .060 by removing the heads and have the seal area of the valve guides machine to get that valve seal clearance correct up twocents

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)