Running rough at lower revs, seems rich from the plugs, float level queries

[His Dudeness]

Start it up and leave it to warm up then throw some water on the headers and see which one dries slowest that'll tell you what cylinder has the problem. After that check the plugs, leads, caps. You could try swapping them around one at a time to another cylinder and see if the problems follows. Carbs would be the next thing if none of that works. It's not likely to be carb rubbers, valve clearance or compression imo