Carter AVS questions

markfh said
I have a 68 Dart GTS 340. I'm rebuilding the carburetor and my Carter AVS 4425S isn't exactly like those I see on the Internet. All the ones I see on the Internet have two idle adjustment screws but mine only has one as you can see in the images. The holes where it appears there should be two are plugged. Any idea why and is it unusual?

Also, any idea what the H7 means? Is that the month and year of manufacture?

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What Rumblefish said is correct.
The '68 Plymouth FSM covers the carb pretty well. The Dodge manual probably does too.
This MTSC covers some of the unique features for carbs that year.
1968 Chrysler Carburetor Service Highlights Service Book - Session 243

One thing to keep in mind is by controlling the idle air bleed, only very fine adjustments can be made.
The objective was to keep these cars idling at a relatively lean mixture (for idle).

1968 Engine Performance Diagnosis (Session 250), Master Technician's Service Conference