8.75 Axle tube. HELP!!!!

I have an 8.75 that came out of a 69 super bee, I put it in my volare with no mods fit and drove good. I now have a 76 feather duster that I wanna put the 8.75 in it but got a lot saying it won't work because the a body came with a 7.25 or 8.25 don't remember, anyways my question is what car or truck with an 8.75 if any would fit in my duster. Thanks I'm advance. I forgot did I say HELP!!!!!