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An improperly installed head gasket might blow out or leak (water or air), but it should not make a clanking noise. Are you sure you installed the right thickness gasket (too thin and the pistons will hit the valves), did not leave any items in the cylinder (nuts, washers, etc) and set the cam/crank timing correctly?
Is this a 3E engine? Improper cam/crank timing (not installing the timing build properly) can result in the pistons hitting the valves.
Also check to make sure the valve train is setup right. Turn the engine over by hand with the valve cover off. See if you can hear or feel something amiss.
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