AAM 10.5 in to a dart, worth the hassle?

I found an '89 D60 out of a 3/4 ton dodge, supposedly the spider gears are welded? whatever that means, it has 4.1's and both wheels spin so I think I'm good to go (besides getting it narrowed) I'm glad I resisted the urge to try with the 10.5, now I just need to remember where that thread about shortening the Dana was.... while my son get's the springs off and preps it of course.. Ain't I a stinker?