[Jimbabwe]

Thank you, Sir!
The narrowing was $275--it would have been cheaper, but we gave him the full rear, un-emptied, because he also wanted the axles.
New axles from Moser were $350. And seals and various tidbits were another few bucks. CJM Chassis on Staten Island did it. Chris, the owner, builds race car chassis, some of which can be seen doing their thing at Englishtown (since you're in NJ)
I wish I could tell you which rear it was. It was an untouched '69 truck, but I could swear my measurements didn't measure the old rear but the later one. Since I don't have a build thread, but have my stuff spread around like I-don't-know-what, and the numbers aren't fresh in my mind anymore, all I can tell you is the rear was narrowed 8 1/2", having the outside mounting point on the drums 54", which is the measurement RustSpot gave me from the S10 rear he has in his truck.