Again, I don't have any idea what your options are for the original axles.
If you look at the picture albums linked below, in both the AD Chevy axle swap and the 61 ford Detroit folders I show the process of swapping axles, both with hydroboosted disc brakes. The Ford even has the original brake master cylinder on the firewall, look at the pictures first, I am not saying that part of the swap was ideal, just the only way I could find to solve the problem.
I gather you have a combo clutch and brake master cylinder?
Grigg
