Edelbrock Gasgacinch will hold the gasket down to the head, but you will not be able to remove it in once piece after it dries. It does work very well though.

http://store.summitracing.com/partdetail.asp?part=edl-9300


'70 Duster 470hp 340/T56 Magnum/8 3/4 3.23 Sure-Grip