Power Valve Selection

I've never heard of cruise vacuum halved -2. That's insane. Think about what that means. Let's say your cruise vacuum is 14hg. You half that and you're at 7. -2 and you're at 5. That means when your engine needs enrichment (14hg at cruise), you are NINE INCHES away from your target. If you use cruise vacuum, the proper way is (again using the 14hg as an example) go -2 from the 14, so 12. Those are sorta hard to find sometimes, so you may end up with a 10 or 10.5. At any rate, you want the PV to be "a bit before" your maximum cruise vacuum reading. That's how I did the slant 6 in Vixen and I can tell a big difference. When do you want enrichment? Off idle like a 6.5 will give, or at cruise when you stab the gas? If you do it that way, you can also back off the main jets a few numbers. I have yet to do that to mine, but it's comin.