Are your 30 spline axles "good " aftermarket ones? If so have the get a Power Lock for the Dana with 30 spline internals. If you sell the 3.91 pig while it's still worth something and that should cover some of the cost of the new venture.
Give Doctordiff a call and Cass will get you setup with all the right parts even the drive shaft.

Gus beer


64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60