Do I read this correctly that the gauges are registering 0 psi, but the car remains running fine?
Regarding the wet plugs, have you adjusted the mixture screws on the front of the carb? There are some videos on the Edlebrock web site that will help you with that. IIRC, they both go in snug and then back out 1.5 turns as a starting point. Not to throw any more parts at the problem, but a 560 cfm for a 400 engine seems a little on the small size; did you mean to say a 650 cfm? Cal