Local Craigslist score - BBP 7-1/4"

I scored a '73 7-1/4" rear axle off Craigslist last week. It came from a disc brake, 318 automatic car, so it has the 10" backing plates. $50. CTC Auto Ranch north of Dallas/Fort Worth wanted $450 for a big bolt pattern rear axle (not sure if that was 7-1/4" or 8-1/4"), so I think this was a pretty good deal.

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I know these are a little different than the early 7-1/4" so my 9" drums won't swap over, but I'm hoping it should bolt right into place once I switch over to disc brakes and should give me the 5 x 4.5" all around. He gave me the springs as well, will these go into an early A body ('64 Dart convertible) if I decide to use them after cleaning them up?