OK, I've been running my 440 Duster around for a couple of years now, Whatever I try to do to tune it, it just wont rev past about 5200 rpm. combo is: 10.2 to 1 440, untouched Edelbrock RPM heads, Lunati 10230703 "Voodoo" cam, old # 60303, Edelbrock dual quad manifold with 2 600cfm Eddy carbs. &...