I forgot if we're running Revision A or B. Can someone enlighten me? Both were allowed but one of them was the default, iirc.

Also: Since the stages are shuffled, can we add a revision check box in the submission menu?

The stage layout you're looking for is Overseas. Most people are playing Out Run (sitdown/upright, Rev B) - that should be the default version when you have OutRun in Mame (the title should be lit, not dimmed out) and you're good to go with that.

Japanese layout has a slightly different stage order and some of the stages are different (Canyon has blue skies, Gateway is tougher, Wheat Field comes earlier and has less offroad objects that you can crash into and in that version it comes as the second stage if you take the first fork to the left).