looking for head identification

There's something Wheels missed. There are casting numbers under the head in the middle of it by the heat cross over is. You need not remove the head. Just use a mirror to look under the head. There are the casting numbers you want. Not the ones up top on the runners in e tween the springs.

FWIW

Only the early year heads have letters cast into them.

That year 360 (86) has 1.88/1.60 valves and will flow around 200cfm.

The 318 always has 1.78/1.50 valves unless it was factory Equiped with a 4bbl. If so Equiped, it has 360 heads & the same size valves as above.

Contact 1wild and crazy for more info and see his sticky for what can be done.