7 1/4" to 8 3/4" rear end swap advice

Hi,I finally found a factory 8 3/4" A body rear end. Complete drum to drum for my 1968 dart 270. I Iwill be swapping out the bad 7 1/4 factory rear and thought I'd ask for any tips or advice from those who have done the swap before. It sounds pretty straightforward and should bolt in easily. I have the u bolts. I am still looking for the correct length driveshaft
I've also seen people use a furniture dolly to wheel the rear end underneath the car. For those who have done this,is there a certain size that is best? I can get an 18 by 12" one at home depot for $11.99 but they have larger sizes at harbor freight.
Will the 8 3/4" pretty much bolt straight in other than the different size u bolts and droevshaft? I'm looking forward to doing this and getting back on the road..and not having to worry about a 7 1/4" rear end failing again.