Well before Braddock and Howell were the top tracks in NJ the top dogs were Vineland (Ran by the Zeuners who also ran a bike shop, it ran under 3 different sanctions) and Craigmeur which was NBA at its peak and then went to ABA just before closing I think.
Your point is well taken though, tracks regardless of sanction should work together. Not just the Jersey tracks but PA, DE, MD, CT and NY also.