I have a 350 ci engine with a 650 Holley Street Avenger. I used a vacuum gauge in the line going from the manifold to the HEI distributor. The highest vacuum level I got was 16 inches. The car ran great but it smelled like it was running rich. I then tried in a dead end hose from the manifold that goes to the pvv valve. I couldn't get it over 15 inches. It ran well and didn't smell like it was rich. Any ideas on how I can do a better job?