MY leak was a pinched black o-ring on #2 exhaust push rod tube not the intake. att: J.H.
Replaced ALL seals on both tubes, greased them up well before instalation,inspected the holes for burrs and found one on exhaust side, that I sanded out with 400gt paper on a 3/4 socket.
Then worked the tubes in gently with a rocking movement. Push rods were fusy about hitting center of the lifters but no problem.
I'll let you know when Im off next week. (if time allows) if it leaked. I have other pending busness.