Ben Johnson did squats, benches, pulldowns, maybe deadlifts.
I don't even think he did plyometrics, but I'd have to go back and read "Speed Trap" and "The Charlie Francis Training System" again to see for sure.
Both are very interesting reads.
Ben would also hide when it came to do distance work. Apparently he was either lazy, or intuitively knew it was going to hurt his event in the long run.