pretty dang close. you make up for the different perch width with diy4x thick washers and chop down your spring bushing 1/4 inch on the inside. easy cheesy.
the WMS is narrower, but with chevy hubs its the same as a chevy.
look closely at the brakelines, dodge did some wierd center brake line thing. im sure if you use chevy calipers it wont matter. my dodge 60 came with a 1350 yoke instead of the chevy 1310-30 whatever. ubolt plates are different, make sure you get those.