Narrowing an 8 1/4" rear end, how is it done?

Just for fun. If I remember correctly…73-76 A body 7 1/4 and 8 1/4 are the same width at 54.40”. Flange to flange, not drum to drum.
8 3/4 will be stronger. Find a C body housing and narrow. Buy axles from dr diff.
Or sell the 8 1/4 and put towards A Body 8 1/4 or 8 3/4.
Just some ideas.