Chevelle currently has 10 bolt. Both non-posi. Will it swap? Thanks.....

Swap whole rear end, then yes. Internals of BOP & Chevy rear do not swap. :D

be careful, some (not all) oldsmobile 12-bolts have 10-bolt internals. They're basically a 10 bolt with 12 bolts holding the cover on.

It will swap, but might be weaker...

But then again, maybe someone swapped in a Chevy 12-bolt into the Cutlass over the years... Can't hurt to check it out...