If your looking for a NEW, not rebuilt or "restored" altenator, Powermaster has a line of "Resto" altenators for Mopars, these have brand new cases, that have that nice newly cast milky aluminum appearance, and all new internals, rated for 13,000 rpm pulley speeds, and correct internals coated/plated/gylptoled/etc...retail is about $100
www.summitracing.com is probally your best source for purchase
The part numbers are:
PN# 7019....Double pulley/2 field terminals/round back
PN# 7018 single pulley/2 field terminals/roundback design
I have several of these in use, after you remove the Powermaster decal, they pass for "NOS' alternators, no casting numbers/stamps/logos