If you have both sets, and are considering going to 11.75” disks in the front, just install the 11x2.5’s.
Setting up the rear brake bias depends on a lot of factors, you can’t just assume the 11x2.5’s will be too much rear brake. Most people run these cars with bigger tires on the back than the front, which means you can run more brake too. And it depends on ride height, torsion bar and rear spring rates, f/r weight balance, even tire compounds (like if you’re running drag radials out back).
On both of my cars with the 11.75’s and 11x2.5’s I was pretty happy with how the front/rear brake bias worked out. If you want it to be perfect you’d have to install an adjustable prop valve, but that goes for the regular 73+ disks and 10x2.5” brakes too.
