Yes vacum is gay, external 60 hubs are gay, 1/2" studs are gay. The wms-wms is almost even with the rear now (1/2" diff). I use offset wheels so my tires already stick out a lot. The narrower front end helped in my set up. There are 4 things that need to be changed 2 biggest things are pad width, and steering arms.
Nedded changes:
Wheel studs- most dodge are 1/2" GM is 9/16 just get new GM ones.
Yoke- dodge yokes are goofey, get a GM yoke or a combo joint
Steering arm- the dodge arm is nearly imopossible to use, go x-over at the same time or find a GM arm
Spring pad width- 1/2" is a lot, I welded spacers on my shackles and trimmed my front bushings. AZ kickin make bushings that allow for the difference too.
Those are the only issues I had with mine. GM stuff bolts on just fine. Make sure you get the dodge spring plate as the passenger side pumpkin studs are 9/16" (as are the stock u-bolts) and located differently.
[edit] I have a kingpin D60 out of a 1990 Dodge 1 ton, no neck 35 spline inners, 4.10's