Hello all, I have a 59 A-B that has a weird detonation problem. I'll start with the specs. It is a 4.25 stroke and 3.3125 bore with a 400 Jr. Cam. Edelbrock block letter heads and edelbrock regular manifold with 2 97's built and jetted by uncle max and I have a new dizzy on built by bubba. The car pulls very hard but it has detonation at mid throttle. Wide open it mellows out. I pulled the choke and the car studders. Any ideas?