Ive been doing it for years. I got pulled over in the Mustang the day before I sold it in Lewiston. He was quite upset that I had spun my tires, and read me the riot act about antiques needing to be original, body paint engine exhaust....than ran my license, and gave me a verbal warning and checked the car out. Whole thing ended in a handshake. Anyway. The law requires you to sign an affidavit that the car is in near original condition. It cannot be your means of daily transportation, and you aren't supposed to be going to get groceries in it, or going to work every day. You sign that the engine is original, or original type, and the car is not heavily modified. There is no mileage, no "car shows only" or any of that. If you drive reasonable, you can drive it a lot, and go under the radar. I have a 75 Nova SS running 585 hp that's been registered as an antique for 8 of the last 13 years, and Ive only been pulled over once in the last 19 years in it, on my way to Oxford for show shine and drag, I was going 50 over near Roys in Auburn, without even realizing it (No traffic at 5 am), another verbal warning. The problem we are having, is that now some of the 80s junkers that wont take a sticker are being put on the road with antique plates. Mustangs are going to be one of the bigger problems. There are so many Fox bodies that are dangerously rusted in the strut towers, and someone is going to get killed. Also, when a 91 Civic is 25, you can imagine the morons will be putting 7" diesel exhausts on them and going antique. Just use some common sense and youll be fine, and don't do burnouts in the middle of Lewiston.....