PVC valve, I thought I`d touch bases with you guys on this, never installed one on my 406, but rethinking this, with the holley 670 PVC port plugged will make it idle on the rich side...? Am I thinking in the right direction here, and if I install one, it should lean out my idle....... what size would I need, can I test the vaccum at the dipstick tube to see if I`m getting say at least 3lbs with a vaccum tester then I should be good with what ever size I buy, but may try to size out the oriface with an adjustable small gate valve for testing purposes to determine the minimum size. Whats your thoughts...?