I was able to get it installed - I was expecting to need to modify the linkage, but it looks like my Carter is identical to the EB this choke is made for. So it went on in about 15 minutes, and everything seems to be actuating as it should. I Still need to find the best place to hook up the 12v and test it out.
Here is my carb as it was:
With the vacuum plug removed:
With the base and linkage attached:
All put together. Didn't think it would be as easy as it was