Engine Stand Position

[CSGAS]

If the shorty is a K-10 (4wd) or if it was big block the trans mounts will be in the rearward position (with a shorter driveshaft for the application) and that will dictate your engine mounts line up with the 4wd (rearmost) holes in the frame.

Some people have taken advantage of this when swapping engines, just to move a small-block back. I've also heard them called "the 6-cylinder position" before, but never looked at one closely, so 6-cylinder trannies may mount in the same rearward hole.