So I bought an 8.75" B body housing, axles and perches for $200...

MechNerd said

Well, here is the stuff I bought. Does it look like it'll work together, or do I have to approach this differently? BTW, I have a 741 case with a 2.76 open in the garage that I'm gonna use to mock it up for the new driveshaft.

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You can look at all the measurements here

An accurate 8 3/4" rear axle width list

But it looks like you have a ‘65-67 B body rear axle based on that 54” and change flange to flange measurement. If that’s the case, you can probably just use that as is if you get wheels with a bit more backspace than standard. Not sure what your plans are for wheels and tires but it’s definitely doable.