7 1/4 width question....after searching

The 73+ BBP 7.25" and 8.25" rear axle housings are 51.5" wide, which makes them 56 3/4" from wheel mounting surface to wheel mounting surface. Significantly narrower than the SBP 8 3/4 which are 57 1/8" and even more narrow than an A-body 8 3/4 that has been converted to BBP axles (57 13/16").

I am not entirely sure about the exact width of the SBP 7.25's. I've heard from multiple sources that you can't just swap the later 7.25" BBP axles into a SBP 7.25" housing to convert it to BBP. Based on what I've seen for tire clearances they're probably closer to the SBP 8 3/4 than they are to the BBP 7.25". But I've never had one to measure, my only 7.25" equipped car was BBP.

cudamark said

The 7 1/4 A-body rear ends with small bolt pattern are all the same from '63 through '76 except for some of the brake parts. Now, comparing the small bolt pattern 7 1/4 with the big bolt pattern.......I don't know. I haven't done that measurement, but, I doubt there's much if any difference since they came with the same track specs.

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That's not an assumption I'd make. Given how different the BBP 7.25" and 8.25 are from the SBP 8 3/4 equipped cars there's no telling how different the track is. Even if the SBP 7.25" housings were the same as the BBP housings the track would be different because of the axle flange offsets (SBP to BBP 8 3/4 is different by 11/16").