I have a question about A/F readings and a cam

Sounds more like the adjuster isn't doing it's job, which points the finger at something other than the cam. I'm guessing big cam, no air bleed for idle, the idle screw is adjusted too far and the t-slots are too far open. But that's just a guess since you haven't given us enough information to know better :D :p

Thanks.
The cam is on a stock 9:1 Magnum with 318A closed chamber 62cc EQ heads.
214/224 @ .50 and 110 LSA
Timing is right at 23-24 intial with 11 mechanical on the distributor and all in @ 2,500 or so.
Vac advance is ported at the carb, and have 52 degrees max possible advance at light throttle.
87 pump fuel
Idle at 800 RPM with the butterflies fully closed and very likely no transition slot use at idle at all.

The idle mix makes a difference just not able to get the A/F ratio up to where it was with the old engine. (around 14:1)

It not a big deal, I just thought I would ask if that's why.

Thinking back on what AJ said about bringing the timing down and opening the idle farther is haunting me now. :D