Also, bear in mind that later steering boxes mounted with larger bolts. As the bolt shanks locate the box, you will need to come up with some sort of bushings to reduce the bolt hole size on the box. Shouldn't be too hard.
If you torque the mounting bolts properly, I've never seen that as an issue. In fact, I kinda like a little extra adjustment in the mounting. It makes aligning the column with the input shaft much easier so there is no strain on the column seal.