Wasn't available from the factory... I wondered whether they changed over to a big block K-frame(they are different from small block ones) or just different motor mounts, and if they went with the larger big block torsion bars. Being an original 340 4speed car makes it a little more valuable, although without the original engine that's subjective. At least the 4speed is original- I've seen a lot of 4 speed conversions that were hack jobs. If it's rust free and straight, might be worth the 11K you're willing to spend.