If you actually get down to the Punta Gorda or Ft. Myers area there are 2 stops you may want to make:
Muscle Car City has a display (indoor) of over 100 cars - mostly muscle vintage so lots of GM chrysler as well as Mustangs and a few oldies
www.musclecarcity.net
Monday nights in North Ft. Myers (Rt 41 at Rt 78) Merchants Crossing has a "cruise in" usually attended by 100 or more cars. All vintages.