To answer the OP question...
Yes that '70 BOP rearend will fit your friend's '66 Chevelle. Installation will require a set of '67 Chevelle coil springs...will have a pigtail on both ends unlike the bolt-in '66 coils which have only one (upper).
The '70 rear is about 5/8" longer on each axle tube but this additional width can be overcome with an increase of wheel offset.
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2017 Camaro RS -217 cu in 365 HP w/8 speed auto
1967 Camaro SS -5.3L LS w/4L60E & 4.11 12 bolt
2019 Cadillac XT5 3.6L V6 w/310 HP & 8 speed AWD
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