Welcome to the forum
I have sold several of my power steering box adapter plates to guys using them on 4x4's. The template for the 2wd's doesn't work, but I do include 3 pics and dimensions for installation on the 4x4's. I agree with Ron. I think you would be better off in converting to the standard side motor mounts. You can use the motor mount crossmember from a '67-'72 4x4. You will just need to drill the bolt holes. In the end I think it would be less work than messing around trying to mount a PS pump with what you have. I'm not sure if converting to a long water pump would work any better with your front mounts. That will depend on just what small block you have and which heads are on it.