GM 8 pin HEI Conversion pics

Even if there is a rotational limitation one would think a simple software change could easily remedy this. (afterall, if the unit can be set for different quantities of cylinders it's probably already programed for direction changes.)
I don't see how firing order would matter, but it would matter if the retard and advance functions only worked one way.
I'd bet that has already been addressed since as 273 stated Chivy makes engines of both directions that use the same ECU controls.
Somewhere in the process I saw a device made by MSD that can alter the timing via the 8 pin module with a type of dial that has degrees of advance marked on it, but I think that was all it did.
Just the possibility of being able to do this, and the fact that some EFI systems used it was the main reason I went with the 8 pin, until I ran across that timing computer.
After that, all kinds of possibilities opened up for using the 8 pin module.

To the67fish,
I think you are right that as long as the distributor was not allowed to make any mechanical changes in the timing it should work fine.