Look at the ID tag...SMA-B, B1 is power steer box...SMA-F,F1 is a manual box Yep they all fit, but they don't look the same.
Thank you Jeff, I just located one of the power boxes to put in my 70. Just thinking about it, it shouldn't be too hard to find a power box considering in the later yrs I would think that more were power than man.
I did the same conversion a few years back. It's a little harder a slow speed, but my wife can drive it so it must not be too bad.