Ok I see what you are saying. If you turn the base 180 it is the same thing as turning the plate 180. The base and HEP do however control which cylinder is connected to which spot on the cap because the HEP has a key in it for the cap .
If you don't turn the plate then the #1 on the cap would not be #1 anymore and you could rename the opposite connections on the cap. This could be confusing to some people because many caps only have the #1 labeled and then it would be wrong.
The firing order is 1-3-4-2 so...
In Dave B's setup you rename the cap from:
Stock:
1 3
2 4
to
David B Reverse Rotation:
1 2
3 4
If you didn't turn the HEP and cap it would be:
Stock:
1 3
2 4
to
ShelGame non turned HEP reverse rotation:
4 3
2 1
And of course to run you would have to turn the base 180 degrees instead of the HEP/cap (which is easy to see in the way I numbered them).
So in Software if you just switched pickup #1 and pickup #2 and rearranged the spark plug wires then it should work.
If you got more radical you could also change the firing order to 1-2-4-3 and maintain the stock number on the cap but it might really mess with the balance of the engine given that it wasn't designed for it. This is not an area that I have studied up on.
-Rich