[DanEC]

After I pulled the excess timing out of it and adjusted the carbs idle mixture it settled down quite a bit. It was left rich from the dyno work. It's pulling betwen 11 and 13 inches vacuum depending on where I set the idle speed - around 12 at 900 -950 rpm.

Here is an ignorant question - especially since I've owned, worked on and restored 4150 Holley equiped Corvettes over the years - where do you check the bowl fuel level on these 4160 600 carbs? There isn't a side port to open to check level and there aren't any top-side float adjustments screws????