Back to the engine again. The Cometic MLS head gaskets looked fine after the heads were removed. The raised ridges were still raised (ie not flattened). Heads back on after machining the pushrod holes. Cut a couple of 0.015" S/S shims to block the crossover passages. Intake on and torqued. Used the recommended Edelbrock 7276 Intake gasket. Glued the gaskets to the heads with Edelbrock Gasgacinch. Used the Right Stuff along the end rails and in the corners.