66 Barracuda drum to disc conversion

Professor Fate said
First off, do you want to keep your 4" bolt circle, or change to the 4.5" bolt circle?
Which rear end do you have?
Check into Doctor Diff. DoctorDiff Drivetrain Components

It has a stock 7 ¼, and preferably change to a 4.5 bolt pattern, since its more common with modern wheels