number D5ZE-10A336-AC if I Google the number it says it's an alternator bracket
From
HERE?
Brief tutorial on Ford Part Numbers:
D5ZE ...
D= Decade, C= 60's, D= 70's, E= 80's, and so on
5= year in decade, C5 would be '65, D5 = 75 , E5= 85, and so on.
Z = Model Line. Z is for Mustang. T= Truck, W is Cougar, sometimes those change, far as I know Z has always meant Mustang.
E = Sub Group. E= Engine.
THen you have the base code which identifies the part. in your case 10A336 is an alternator bracket. As you saw in the above link the gase was also used in C9 for an alt bracket.
Then there is the suffix/ revision. here it's AC. I've never figured out how that worked. If it's hex based it's the 19th version, read another way it would be the 49th revision, if not hex it could be the 3rd revision of the first revision ... WTF?
Anyhow, to answer your question, I've seen those, IIRC it bolts to the bosses on the front of hte head, Damned if I remember which side or the orientation, more than likely the pedestals of varying height are the head side.
It's been quite a while since I've seen D5Z brackets installed. Or even a D5Z bracket.
Incidentally, when you see D5ZE parts it's safe to bet their from the 302. Engine parts specific to the II from the other two engines usually wear a D4.