""Sorry, I'm not sure what this means.""

No problem. The picture shows the "air bleeds" (8 goldish in color with the flat screw driver slot. 4 in the front and 4 in the back).

The reason that I am asking about the carb is because we know that you are working with a BG 850-VAC unit, but there are different levels. Some may have or some may not have the "screw in" air bleeds which are much easier to tune.

7836143-DSC01721.JPG (80 downloads)

1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)