I have been trying to correct what I believe is a lean condition with my carb. Problems are a bad bog when accelerating and some bucking when cruising at lower rpms. I tried reading up on how to read a vacuum gauge, but it seems there 5 or 6 different possible reasons for a low, erratic vacuum reading at idle. I've made a few adjustments to the carb to make it richer and the car is running better - not great, but is starting to smell rich. Engine is a 351W with Edelbrock Performer RPM heads, intake, cam, and an Edelbrock 1406 carb - 600 cfm, vacuum secondaries. I think this vacuum reading is lower than it should be with these parts.