'78-400, Alt. & pulley?'s

The Alt. there is what is normally seen on later years. The engine is a '78-400 codes HP.
That Alt. also came on my '79 - 360 engine. Not a police package car.

I have not measured the diameter of it. I didn't think of it actually. Good thinking. I'll do that later.
And the deeper pulley, one of the places you mentioned would have it?