Does anyone know the curb weight of a 69 Mach 1, 390, 4-speed? I live in Florida and at some point I'm going to request to have an old license plate authenticated and registered for my car. Back in the early days Florida used an alpha numeric numbering system to indicate the county and weight class of the vehicle. I can submit any county/weight class plate to the DMV to request authentication as long as the year of the plate is the same as the model year of my car. However, I'd like to have the correct weight class on the tag.