Newbie Super Six question

First off, welcome to the best site for info. I have a 71 also. To ID a 2bbl in a yard. 2bbl carb are held on with 4 bolts. Also look in truck up to 86, I think thats when they stopped useing them. I search for a long time for 1 with no luck. Ending up getting a Offen 4bbl. Althou little much for a stock slant, it will work great with head upgrade later. I went with a Lokar kick down. I just looked at the yard to get linkage from a 4bbl van and had to make it work. You could just buy from places like Summit. Hope this info helps ya out.