If you look closely at the firing order in the Hall-Scott engine and move the #1 to the rear and read it backwards, it comes out 1-5-3-6-2-4, so it's basically the same firing order with a different rotation, either of the crank or distributor, maybe both. Stock49 did a better job of explaining it than I did, but it's still your basic inline six cylinder firing order. I don't think that there is much you can do to change it and have the engine still function properly.
