What do I have for my power steering box?

[moparfever]

My 70 Cuda was updated to power steering long before I bought it. It works fine no problems with it. But I would like to find out what year and what it came off of. I looked and can't find any answers to my question of what year or make . Casting numbers I can make out are,
O or Q -3643012
R 13
date code ? , 154
It also has a large O on the web.
If anyone can help it would be great.

 

[tonysrt]

The pitman arm is small up to 73, 1 1/8" and big one after is 1 1/4". That's all I know about steering boxes. Hopefully you have bigger pitman arm.