64 rear end help

I've been there & done this, I was told that you could redrill the smbp axles to the large which is what I have done on an 8.75 rear.Then you still have the issue with the drums. I finally got it together but we will see how she holds. The other problem with this route is that the sbp has a smaller center hub so I had an adapter made. It was a pain in the butt & I have about a grand tied up with the original purchase price of the rear. unfortunately I dont think you will get a posi 8.75 for much less if any. I have an 8.25 open that will fit its complete & taking up space....