rear end swap, Dart 318

I have acquired a 72 banjo with 8 3/4 diff. No axles except for B body ones that are too long.

With all the builds that have been done, what does one suggest? Is it possible to shorten the B-body axles, I am trying to do this on a budget. My 74 Swinger 318, has large bolt pattern that takes C-body rims.

Any suggestions on services that shorten axles and to what length is needed.

Thanks, Dave in Virginia.