11.75" vs stock 73+ 10.97" CALIPERS???

Yes, the stock calipers work just fine. Some of the later calipers have slightly larger pistons, but the pads are the same size as the earlier calipers.

Reason being is, the 11.75" rotors have the same width braking surface as the smaller 10.8" rotors. Now, just because the width is the same doesn't mean the area is the same- its the same width with a larger circumference, so the pad sweeps out a larger area.

But the biggest advantage is moving the caliper further out from the hub, which increases the leverage. Kinda like putting a cheater bar on your ratchet.

As far as the master cylinder, you should be ok if you keep your stock calipers. You will increase the stopping power in the front, so your front/rear balance will change a little. With my Challenger that was actually a good thing, I found the stock balance to be a little too rear biased anyway. If you do go to later calipers, it will change your bias again because of the larger volume needed for the larger pistons. In that case, it might be best to match the master cylinder to the calipers. The brake booster will be fine.