Hi Geof, It's good to be back. Please give Nella a big old HUG for me!
Summit says 60179 heads are designed for non-emission 1968-73 340 C.I.D. Chrysler engines. RPM Chrysler 340 heads have chambers machined .060" for clearance with early high-compression engines. Not so on the 60779 heads. Not sure what you're saying on head gasket. higgs, Alex & Dave are the best!