Camel or double hump due to the marking on the end of the heads. #3927186 will be found in the rocker area if that is indeed what you have. Not sure of all the motors they came on but they were on the 69 302 Z28 motor and have 2.02" intake and 1'60" exhaust valve sizes.
Camel humps were actually on several different heads of which some had the 1.94"/1.50" valves but had different casting #'s.