I am pretty sure I have a vacuum leak. At Idle I am running around 10-13 in h20 and is fairly inconsistant. I have a semi mild roller cam 228/232 dur 597/609 lift 112 lobe sep and feel my idle vacuum should be in the 14-17 range. I have checked and rechecked the carb base gasket and all lines. Carb is new. Engine has less than 3K. I have suspected it to be an issue since I firts fired it up. Next items would be power brake booster and PVC valve. How can i check the power brake booster to see if its OK. Is it as simple as pulling a vacuum on it with a mighty vac and see if it holds? Could the PVC valve be the problem? Any other areas to check.