Holley Flooding Engine and Spewing Gas

Thanks everyone for the quick replies. I've had the needle and seat assemblies out more than once. Sprayed them off with carb cleaner then gently blew with an air nozzle.
In the book I purchased I saw a special tool for testing the power valve, but is there a way to check it without that? It looked rather pricey.
I still have some off the old parts like the needle/seat and the old power valve. I guess I could try putting those back and to see what happens since there's nothing left to lose at this point. I'll also go back to examine those passages pishta mentioned. I'll post back later today with the results.