I would skip the RTV altogether.....
Use the Right Stuff, TA-31, Dow-Corning silicone, or similar. Put a small smear around every port on the heads, lay the gaskets down, then set the intake on it and let it sit overnight. Go back the next day, smear some more on the gasket around the ports, lay your beads down for the end gaskets, then set the intake on, start the bolts, set the distributor (make sure intake is centered around it), then tighten her down.