Wagon rears?

[Phantom440]

Hello all,
There's a '71 Coronet Crestwood in my local boneyard. It's been there awhile and it's pretty picked over... but the rear is still in it. Unfortunately, it's sunk in mud up to the back bumper, so I cannot tell what kind of rear it's got.
I'm fairly certain it has a small block, but it also had the round-gauge cluster (Were those standard in Crestwoods? I'm not sure). All I'm trying to say, is this seems to have been a well-optioned car when new.
Did all '71 and up B-wagons come with an 8.75? I don't want to bug the guys in the yard to come out with their cherry picker, dig through the briarpatches, haul the back of this wagon up in the air only to see it's an 8.25!
Thank you in advance for your help!

 

[YY1]

They're wide, like a C body wide!

 

[Phantom440]

Well, here's my thinking, and I'd love everyone's opinion on it, as I'm not sure if this has been done before...
I have a '72 Coronet sedan, and as far as I can tell, the spring perches are the same between wagons and sedans... but the overall width for the rear is 63" for sedans vs. 64 3/8" (I think?) for wagons.
I'm building this into a stunt/movie car (it won't get hurt, I promise. I've put too much work into it!), and for simplicity's sake I'd like to run the same size tire on all four corners.
Often when you do that, especially on the sedans, it kind of looks like the back wheels don't fill out the wheel well as it should. I know it's only ~5/8" wider per side, but I hope this will help it look a little more aggressive.
What do you guys think?

 

[YY1]

Those cars have big wheel wells, you'll probably be OK.

 

[Phantom440]

Thank you- that's what I'm hoping for, anyway!