Hey Gun,
Whatcha planning on using for the rear end? I have both A-bdy and B-bdy rears in my stash but I'm leaning very heavily toward the Dakota 8-1/4" for my '64 GT. Main reason is the stand-alone rear wheel anti-lock brake system (RWAL). Look for the article in Mopar Action by Ehrenberg a few issues back.
The earliest ones had 5 lug flanges (up to '91?). Up until '96 they were 27 spline and if posi used Auburn series 3 carriers. Starting in '97 they became 29 spline and posi was Trac Loc series 3 carriers. They'll easily hold way more power than your 5.9 will put to it. I seem to understand there are people running in the 10's on slicks without breakage.
I already have a 27 spline 3.55 SG unit. My plan is to shorten it and eliminate the C-clips by using 8-3/4" / Dana housing ends. I don't know if I'll need custom axles, or if the ones from a Dana or 9-1/4" have enough meat on them to be cut and resplined.
Just wish my Dart was anywhere near as clean as your starting point, but thats what sandblasting and welding were invented for. Subscribed.
Mike in FL
