It is a FE engine correct? 15426378 is correct and should be on the intake manifold also. Does the valve cover go over both the head and part of the intake? Also tell me if there are and casting numbers you can read off the intake or heads. On FE heads the number is between the center two spark plugs. Intake will be on the front by the thermostat housing. Does the engine have a expansion tank bolted to the thermostat housing? G.