Caliper upgrade???

If it has the original A-body calipers you can upgrade to calipers from the later F/M/J/B/R cars. As long as you get the same style (slider or pins) they'll bolt right on. It's not a huge difference, but the pistons on the later calipers are larger so they do provide some more stopping power. The A-body calipers have a bore of 2.6", the later ones are 2.75".