Cant make this valve train noise go away!

I have a tick in my fastback... Have tried 2 different voodoo cams and still there. Comes and goes.... Gets louder then quieter.... Only notice it at idle... embarresing... Brand new motor.
I am rebuilding a magnum 5.9 so I can go roller. Im done with flat tappets!
Go solid flat tappet and it sounds like a sewing machine purring. Lots cheaper than a roller and make comparable power. Got one in my 408 and I love it