I suppose you could split them and resize them after the leanup as well.
Here is what happens if you don't split/resize. I took the raw image, resized it for the univerrsal game case, printed it out and tried it. The SNES scan is very close to correct.
Here are the results:

This is the spine, as you can see its not too bad, however, the super in super r-type rolls over to the front and appears cut off.

As you can see from the white line, the spine is almost 1/4" on the rear cover. (same on the front)
the white line (cover crease) should line up with the hinge.
Like I said, overall not too bad a fit, but the spine is about 1/2" too wide overall.
Hope this helps.