Found narrowed dana housing with axles and long studs WIW

What axles? Aftermarket or resplined stockers, 16 spline instead of 30 or 35... lots of variables.

Make darn sure the case has the original caps on it too.

For a good empty case, I'd give $100 for it if it was straight and ends welded on well. Axles are a crapshoot unless you can clearly identify them.

A 48" flange length rear is going to be about 53" total drum to drum.