After getting incorrect information directly from Mopar Part Assistance, I figured I'd share that out of the 220, 180, and 160 MDS alternators the 160 is the only small case of the three. Part #04801866AC fit in my ebody without needing to modify anything. This may already be common knowledge but I figured it may be worth repeating.

I'll be hooking this to a pre-70 P3690732 regulator to regulate the 13.5v output.