[carnut]

I have a similar problem on my 302. I have the same 14 inch vacuum at idle, but with a 600 Holley and a mild Crane hydraulic roller cam. I tried two breathers, one breather and one PCV valve and now two PCV valves, still the same. It only smokes heavily when I get on it in first and second gear. One of my gearhead buddies said it might be piston slap. My compression is 130 lbs. on all eight cylinders. A Ford website noticed a lot of blow by on a racing motor and was told to try a vacuum pump, but being that mine is just a mild street motor, I'm looking into the vacuum theory through other avenues. Good luck.