Back in law school, my professor said, "look for the intent". I BELIEVE the intent of the rule is to allow ignition controllers, of any kind, BUT, they should only control ignition. Also the original post was in 2006 when traction control was a hot topic. Most all OEM computers control fuel injection and ignition, together. I believe the rule was to keep fuel delivery 'vintage'. It is my belief that your MSD should be legal, but,,,,,,,,, you are best to contact the rule chair. Back in 06 I think that was Roy, and his e-mail address should be in the rule book.
Good luck, RICK
ps, I dropped out of law school to build hot rods,,,,, no regrets!