Running both the recirc valve and an atmospheric dump valve is a recipe for disaster. They tend to overfuel and run poorly as the lads have said but in theory you should be able to run the atmospheric type if you blank off the recirc valve pipes and take out the recirc valve completely, then just run the atmospheric valve on its own.

I have seen guys do this before and they say it runs fine but to be honest i have a gen 2 and a forge recirc valve and it sounds as good as an atmospheric dump valve and the car is running as Ford intended.

anyway to cut a long story short don't run the 2 of them together and i would give back the atmospheric dump valve and get yourself a gen 2 induction instead. You will get more power and its a far better mod for your money.