I think I recall seeing something in a Mopar mag., Collectors Guide maybe?, and there was a display set up in some auto museum somewhere.
Welcome to the site.
The only thing I'll add is in reguard to the Bullitt Chargers. The Cuda-Challenger link says that all were destroyed. I seem to remember one of the cars surviving. I don't know if any documentation ever surfaced though.
There was a thread on it a while back probably on Moparts. The car was origonally yellow and had been repainted black. It also had a bunch of extra holes drilled in it for the cammera mounts. A few origonal pics were posted of the car during filming with all the rigs installed. The extra holes seemed to match the mounting points seen in those old pics.