Plastic gift card under the gasket with carb cleaner works for me.
Work it around like a putty knife and it should get it all off. Follow up with a razor blade on the engine side and a brass brush on the pan itself.

Good luck!

1989 Dodge Power Ram 50 w/ no engine <- rotten frame <img src="/forums/images/graemlins/frown.gif" alt="" />
1988 Power Ram 50 2.6 Long Bed
1990 Mitsubishi MightyMax V6, swapping to the Daimler-Benz OM617 3.0L I5 diesel