Shortening 9 1/4 and mini tubs

I am building an 8 3/4 for my dart using a C body station wagon rear. As soon as I get it cleaned up it is going to Moser for narrowing and cutting & resplining on the stock axles. They charge $110 to narrow and $110 to cut and respline the axles. You can get it made to any width you like and will get the heavy duty brakes as an upgrade that way.