engine stand?

I would think that if you make your transmission mount, and then bolt any popular engine/transmission combo up....and then square it up with the k frame attached, and then make provisions on the rack to mount said k frame. After that, any other combo of motor/trans/k frame should bolt right in the same spot. The frame rails, torsion bar cross members and stuff in our old cars is all the same, and what makes the difference is the k frame and motor mounts. On your rack, you would just have to make the front portion adjustable so you could mount an A body k frame, or B/E body k frames. Make sense?