intake manifold leaking oil into cylinders. any ideas?

As said use "RTV" or even better "The Right Stuff" although sometimes hard to find BUT not only around the water ports but also a little on both sides of the gasket and make sure that when you set the intake on the motor that it is laid down carefully, level and straight. Good luck. Sometimes 4 hands is useful specially if you have a heavy stock intake.
If you want more details, PM me.

Jean-Guy