Back in 1961, two friends of mine purchased identical ( in appearence ) black, 348cu.in.,three-speed '61 Chevy Impalas. The difference was that one was a 280 hp and the other was a 350hp. On occaision, they would arrange a race with the 280hp car, and then tell the opponent they were going to stop for gas or some other bogus excuse. They would then go home and get the 350hp car. The only visual difference was one car had a deck arial and the other didn't. No one ever picked up on that though.....good thing! Also, they couldn't let anyone too close to hear the solid lifters of the "special-super turbo-thrust" 350. The original "280 car" is pictured.