So, my question is, what do i have here? Does the C2 mean March of 1972? If it is a replacement, should it not be 4611SA?
Curt, you are correct on both counts.
Also, carb tag colors can help to identify thier original purpose; gold anodized tags were often found on replacement carbs, production examples (for a vintage AVS) were typically silver, blue, or red/burgundy. The link that I sent should also help illustrate that. Also, many of replacement carbs of the era had the added "A" after the "S" like you mentioned. Production line versions just had the "S" after the number.
Here is one from April 1969 that is a replacement model. Would not be desired in your application.
http://www.ebay.ca/itm/1969-340-4-S...r-AVS-D9-Mopar-Swinger-Cuda-GTS-/230999611688
There were some other minor details outside of the finish that had my "spidey sense" tingling. Now that you tell me that it had an electronic ignition upgrade as well makes me think that someone was trying to improve the overall driveability of your car at some point along the way.
That link that I sent would be a correct application for your car based upon a winter 68 or early spring 69 SPD. IIRC, your car's build date on the fender tag was Thursday, March 13, 1969, so that carb in my original link is a "better fit".
I am not trying to be confrontational, just trying to pass along information that you can put in your tool box down the road. I recognize your first priority is to get the car running (which should be everyone's priority). Hell, you have more history (twice) with that car than anyone else ever will. If down the road you are looking to improve upon the car, you will have an idea of what to look for.
I appreciate the stories of how it ran against other cars back in the day, and from the looks of it it will run that way again soon! Keep pushing forward!