Plymouth built only 635 ‘Cuda convertibles for the entire 1970 model year, and a rare handful carried an engine option that turns this ragtop from a nice classic into a seven-figure collectible. The color hiding under the folded top tends to split Mopar fans right down the middle. What’s actually bolted between the fenders changes the story completely. Read on to find out why.

This blue 1971 Chevrolet Corvette Stingray carries the LT1 badge, a solid-lifter small-block only 1,949 buyers ordered that year, out of 21,801 Corvettes built. Sitting right at the hinge point of the muscle car era, before compression ratios and horsepower figures collapsed across the board, this car represents one of the last genuinely quick factory small-block Corvettes. Read on to find out what separates an LT1 from an ordinary 1971 Stingray.

This orange 1969 Pontiac Firebird convertible represents the final model year of the first-generation Firebird, a body style Pontiac kept in production into early 1970 while the redesigned second generation was finalized. Only 11,657 convertibles were built that year, and just eight came as genuine Trans Ams. Read on to find out what separates a true 1969 from the Firebirds built before and after it.