11" Disk Brakes on 14" Wheels

IDK about 14 in Vector rims so no help there. I do know that 14 in rims will fit over the standard 73-76 A Body disc with the 10.75 calipers. If The M Body stuff has the 10.75 caliper adapters the Vectors might fit even though the spindle is just a bit taller than the 63-76 A Body stuff. I agree with the other poster everything needs to be installed and checked for sure. Good luck on the swap.