The alternator still has a v-belt pulley on it, so it looks like the transformation to serpentine wasn't quite done yet.
You'll need one of these alternators:
By the way ... if you want a serpentine set-up, most of you can order a complete kit from March for your V-8. The components in this "kit" are for a Ford, a Mopar, a SBC and a BBC, plus one generic Moroso spacer. You should see the pile of parts we went through that didn't fit.