I posted this in the nailhead section but haven't gotten an answer so I thought that I'd try it here. I found another carb. It's an AFB with the # 3503-SA-K2 stamped on it. Does anyone here know if it's for a nailhead? If yes, then what size/year? If not, do you know what it is from? Thanx!
Carter AFB ID :beer Fred: You were close! The 3503sa is for 1963 Buick series 4400 through 4800 with the 401 engine and automatic. Have a good one, Frank Power