[Big-Foot]

That alternator appears to be what would come on the 4.6-5.4l v8s.. It bolts straight down between the cylinder heads in the front of the intake valley.. Adjustment comes via an idler pulley.
It's a 4G unit (which are rather large) and not a very clean one at that..

In the interest of saving space and complexity - I would advise that you look into any of the 1-wire alternators out there. I bought a new "Chrome" Delphi 130 amp single wire unit on eBay for $75 US. It's about 2/3 the size of the 4G you have there.

Check my build site (link below) for pictures and the bracket I made for it..