how to mount powersteering box on non power frame?

[BBC Motorhead]

I bought a truck in parts and come to find out the frame must be a '67. The area where the steering box mounts has the outward dimples for the four mounting bolts but no indent on the frame. I have a box with the numbers 7802644 on it. I read this is a newer box but should fit. Would I be crazy to put some small spacers in so it clears or is there a better way. I should also add the frame is already powder coated don't really want to cut or weld to it.

Thanks in advance!