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

Most B/E body axles can't be shortened to A-body length. Which is not to say they can't be shortened, but the location on the B/E axle you need to make it A-body length isn't large enough in diameter. You can make most of them shorter than A-body length because they step back up in diameter.

To shorten a stock axle shaft to A-body axle length the axles pretty much have to be C-body or truck axles.
exactly. thank you for articulating it in a more concise manner.

this day in age even finding somebody to respline axles is damn near impossible, let alone what they want to charge you for the work. better off just buying new units.

it's almost the same with C barge and truck/van axles. unless you can shorten them yourself, R&R the bearings and studs yourself by the time you buy the parts you're almost ahead getting a set of freshies.