7 1/4 to 8 1/4 Swap

I'm planning on doing a rear end swap over my Christmas break this year, I already have an 8 1/4 from a 76 F-body (Aspen I believe), its got 3.21s and sure grip, so it's a step up from my peg leg 2.76 7 1/4. I know that the F-body axle is wider than the A, and the bolt pattern is BBP anyways, so I'll need new wheels, I'm going to measure offset on my Cragars and find some cheap steelies that won't hit the fenders. The spring perches are also different on the F-bodies, too, right? I'm planning on getting a relocation kit for those, and while I'm at it, find some Durango springs in a junkyard (or my driveway) and add redo the springs with those. From what I've seen the pinion length shouldn't cause problems with the driveshaft, but on that note, is this axle a bigger u joint, and is there an adapter ujoint that will work for me? For those of you that have done the swap, what do I need to be careful about, mistakes to avoid making? Just trying to plan ahead enough to get the project done within budget and time constraints.