Edelbrock AVS - distributor vacum port

I am going to try both sides for the heck of it. Ever since I replaced my distributor with a FBO recurve, at high speed to the floor I get detonation clatter. I may put my Mopar performance curved distributor back in just to confirm what the cause is. If it clatters with either distributor I am replacing wires next. Then remove the Champoin 9s and put in 11s.