Every year NMCA opens the book twice a year and asks for rules revisions to be submitted. I am the one who sent in the rule and got the Holley based 4150 carburetor in the class for all combinations.
NMCA wrote the rule a specific way and posted it. Like it or not... it is the way it was written and has been written for over a year.
If folks want something different, submit a rules request when they ask for them. They take all requests and in the case of NSS they discuss the requests with the three member rules committee. To be transparent, I am one of the three.

If yall want to have a rules discussion, we can do it in another post rather than step all over Dougs post. My intent wasn't to pick on Doug. It was to keep him from getting in a mess with tech.