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Gents my Dad, a 40+ year professional mechanic on large industrial engines by trade, told me to almost never use gasket compound, especially under head gaskets. Head gaskets are by design a metallic faced or all metallic compression gasket. He ALWAYS lightly smeared a thin coat of bearing grease on both mating metal surfaces, in your case head and block then put them together. The principle is to lubricate the surfaces to let the gasket move under compression to achieve a good seal. These components are to be torqued specifed values and engineers (I am one) were paid good money to design these engines to be assembled in a specific way. Use a light coat of grease and forget gasket compound for head gaskets. Also, torque the heads bolts down to their specified torque value in the specific sequence your manual tells you to. When in doubt and you have no manual always start from the middle and work out at diagonals. Starting from one end or working from the ends toward the middle can and will warp your heads. ALWAYS lubricate your o-rings and mating surfaces, keeps them from rolling or tearing and holds them in place on flat surfaces of face seal applications. Gasket compound is for composite gaskets like used under water pumps or what ever. I rarely use Form-a-Gasket at all and my machines do not leak after I have assembled them. The grease trick makes things come apart easier and clean up quicker. OLd gaskets wil not bond to mating surfaces. In my opinion gasket compound is for lazy mecahincs that don't want to take the time to make sure mating metal surfaces are clean and free of old gasket material.
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