we have a 64.5 Indy Pace Car that we've decided to sell. only 190 were made and only 60 are known to exist. 90k original miles, engine 260 V8 and C4 trans recently rebuilt. lifelong Texas car, all original metal, 100% rust free. new brakes/tires/interior. Car needs nothing. the last one i saw sell brought 32k at a Mecum auction back in May. $34,500/best
fyi- http://www.classicmusclecars.com is a dealer in IL which has 4 of these pace cars. all 4 of them are priced above 50k.
here's a link to some info on these rare mustangs in case you're not familiar with them-