Stumped and Frustrated with a Holley 670 Hesitation

Figure I would just give a update on this Whooshing sound.. Didnt get to play with the car a lot before I put it away for the year. But when I did get some time I pulled the carb spacer out and mounted the carb right to the manifold. Took it out drove it and still had the whoosh sound. Again, its only happening when I go WOT, let off and the secondaries begin to close. The faster or slower I let off the gas determines the length of the whoosh sound.

I put the car away for the year, but I'm going to probably pull the intake and reseal it, just to eliminate that as a issue. Sorry guys, wish I had more news for you about this..