That should be correct, the earlier rearends are what you have and the later - like the one in my 68 GTO are over 62" wide .
I know you have been looking for rearends, have you found any from a Dodge b-body cars maybe on ebay? They are about 59 1/4" wide and have the smaller 4 1/2" bolt pattern.
66-70 9 3/4" ( Dana 60) and 62-70 8 3/4" . Either should be strong enough for what you need.
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Illinois Outlaw Gassers
6.27@107
9.97@131
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