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number you gave
The 1234567890 are test number (example stampings to compare to) they mean nothing.
1385724-F Is most likely the casting number which will tell you it is a 10 bolt 8.5 cutlas rear if it is original. I am not that great with the casting numbers. If you have a picture I know the gm rears by physical casting identification (sight)
J-159
this could be a date code of when the housing was cast J = 10th month Oct. 15 th day and 9 is 1969 ...But that usually is chevy stuff.
Jim
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