yes I kinda think it is a E-body housing at 56.5 flange to flange with 46" perch centers 30" axles.

the 742-3.23open with the 10 spline pinion 1330 yoke is dated 67 on the ring gear.

that chunk was an option on a 67 426/440 polara which also shares the 46" perch centers. found this looking up the 1330 u-joint.

maybe someone swapped the e-body housing in the polara. would not be that much of a difference in trac width. maybe 1" from the chart specs.

or the junkman was referring to the chunk only?

11x2.5 sound right for a BB auto/4 speed E-body but I never looked at many of those e-bodys myself to know.

IIRC I can run a 2" shoe in a 2.5 drum correct?