In my swap, I used the steel motor mount (frame pad) for the our cars - Moroso part 62630.
The centerline of the tube/bolt appears to be almost exactly 1" off the frame, but I did not mic this (I am however holding one in my hand with a tape measure).
This can be matched with either a steel mount (block mount) like Moroso part 62515, which I originally used, or the interlocking urethane unit from Energy Suspension part 31117 to which I am switching tomorrow (Coincidence? I think not!)
Note that these are the "high and narrow" mounts, spec'ed for Montes and related full sized Chevys, not the "short and wide" design.
If using the above Morosos 62515 the centerline sits 2-9/32" off/below the block.
The Energy Suspension 31117 (use the base plate) centerline will sit 2-3/16" off/below the block.
Don't know how that compares to the OE clamshell or what you may be using on your LS2 if different.