Valve cover leak, Help!

I've owned 3 set of the cast mopar valvecovers,all 3 needed to be grinded down where they were hitting the intake runners,i've had good luck with the mopar performance gaskets the ones that are rubber with the steel core,i've had the covers off and on numerous time,and they never leaked...I always use a 1/4" ratchet when tightening them down,i like to go a little past hand tight..