I bought a 68 coupe without an engine or interior. According to the VIN, it was originally an I6. It was updated to an 8 at some point. I have an 87 5.0L being rebuilt to drop in it. My guess is it was raced at some point (the linelocker was a clue). I'm in the process of replacing the front suspension before dropping the engine in (new tie rods, LCA's, ball joints, etc.). Since I was pulling the coil springs to replace the upper ball joint, I decided to put new springs in. I ordered new springs from CJ Pony ( CS8534 68-70 302351 69-70 Boss 302 1968-1970). I pulled the first spring and compared it to the new ones. Placing them upside down on a flat surface and measuring from the inside to the end of the coil, the old one is 16 3/4" and the new ones are 15". The wire diameter appears to be the same. Should I assume the old ones were meant for a much larger engine than my 5.0L or should I question whether or not I was sent the wrong ones? They had no markings or sticker.