The numbers on your website are all casting numbers. I need the stamped code that is on the machined pad just to the rear of the distributor. You may need to use some sandpaper to see it. I have seen some later engines that didn't have this, but they were all 1960's vintage. Yes, I am aware that some 261's didn't have the bars, but these are the exception, not the rule. The difference between model B carbs is the throttle bore diameter.
216 is 1-1/2"
235 is 1-9/16"
261 is 1-11/16"
mouting bolt spacing on the 216 is about 2-3/4" where as the 235 and 261 are about 3"
