HI.....I have the oppurtunity to purchase two Carter YF carbs but I don't have any idea which is the right one (or both) that will fit my 235 engine built in 1955 for my 3100 1954PU.. Here are the numbers..Carter YF L35 1-630 938SA 6-1657 stamped on the float chamber numbers 0-944. The last patent number is 2241655.... The other reads Carter YF CR 6-792 stamped on the float chamber numbers X1538. The last patent number is 2658733....any help would be great on this post I'm always reading how good the Carters are compared with my leakchester B and how hard they are to find.....THANKS, Steve ohwell