Looks like you're serious. I see that you went with my Viper kit up front. You should be happy with those brakes. Are you getting the Baer two piece rotors to go with the Viper calipers? Which brakes are you going with out back?
The '69 K frame might not have been the best way to go due to the anti-sway bar design. Hard to say, there are pluses and minuses either way. I prefer the '73 and up K frame since it has a better anti-sway bar design but some people don't like the spool mounts. On Tim's Valiant we tried early and later K frames and then eventually fabricated a circle track style anti-sway bar with spline drive on each end. Once you start pushing the car hard the production designs just have too many compromises to work well.