36171587-5 Heads...

Not the same but in general, they are all very close to each other. For starters, the ports are slightly revised. Nothing special to yell about. The valves are 1.88 - 1.60.
Depending on the year of the head, they could have rotors on the springs, discard for performance usage.

Your going to have to cc the head to know where you stand for milling purposes. Match the heads cc amount to the 318 head amount at a min. OR if you have replaced the pistons, know where they stand in the cylinder and start doing the math for a decent ratio.