Rear end swap- Anybody know trucks?

I found an 82 Dodge 1/2 ton rear end - 8 3/4", 489 case, 3.23 gears for sale through my local mopar club.

The spring perch dimension on my 73 scamp should be 43". I had the guy measure his (he's about 2 hours away from me) and he came up with 43 1/4". I pressed him for accuracy and he was pretty certain that was an accurate measurement.


Does this make sense? If it's an accurate measurement, would an 1/8" (per side) difference matter? Does anybody out there know the pickup specs? I can't find any online.

Thanks