Actually, I'm running a new "E" cam. The vacumm guage is rock steady at 14hg or 15hg depending on where my ignition timing is set. But also, I'm at about 5400 feet in elevation. Assuming a vacumm drop of 1 hg per 1000 feet in elevation the 14-15 hg is perfect. Having removed a more agressive cam because of the elevation and switching to a more milder cam, the carb now needs some tuning. I've got the jets and rods close, now time to tackle the spring. Currently I have a spring which is rated at 8hg. That seems mild with my new vacuum readings......