Yes the SOHC 427 was band from the get go............BUT......it was Chrysler screaming about how unfair it was.....GM was operating on a "No official " involvement in racing at the time
If by screaming you mean developing a DOHC Hemi, you'd be right. It, along with Ford's SOHC, got banned before they ever raced in NASCAR.
To Ford's credit, the SOHC was produced and sold over counter. There were a number of drag cars running then. There are still some out there running nostalgia style events.
