An auto shop teacher I had back in about 1975 had a 66 or 67 442 that he bought new and maintained perfectly (it was all stock). It was a 3 spd on the floor. We asked him why he didn't get a 4 spd. He said, "Boys, 4th gear cost $100". Turned out the 3 spd was standard and the 4 spd was a $100 option. :)
He was a super nice guy.