Drum to disc swap

Have a 69 Barracuda, was a 318 car...now 340.

In lieu of the usual swap thats posted everywhere, (change UCA's and spindles from 73 to 76 A body), I'm considering a kit like Wilwood or SSBC so I don't have the hassle of replacing my rally wheels, new TA's, on my 4" bolt patern.

Finding decent used parts are scarce and expensive.

I think I would prefer the newer technologyand not give up my SB pattern A body :scratch: SG as well.

With this newer stuff, the UCA's and spindles won't need to be replaced, however, they must be from a 10" drum arrangement, so the new bearings and rotors will fit.

The existing drums do measure 10" inside.

Question: If the car was built with 9" spindles and drums originally, would it be possible for someone to upgrade to 10" drums and bearings without changing spindles?

It's really important to know if these spindles are from a 10" drum arragement since the aftermarket components won't fit 9".