As you found out, the "with AC" alternator bracket has extra bracing at the top and a fixed swing arc. Not very flexible.

When the squareback wouldn't cut it for me I took the setup from my core engine... the big 100+A Chrysler unit per the pic. It works great... just heavy.

The swing arc for the Chrysler alternator and matching brackets is bigger than the Denso. As a winter project I'll try to fab an adator fitting to mount the Denso in the Chrysler bracket.

PS: I had to lengthen the water neck by about 2" so the stock type top hose would clear the belts with room to spare. Not shown in the pic.