Holley 1920 carburetor identification HELP!!

There are 2 floats: a 12.7 oz and a 7.4 oz (if I recall the numbers right). You can put either one in; I have both and they look identical. (I only know I had a 7.4 oz one since I actually weighed it on a powder scale....) I have a 7.4 oz in my 1920 and it should be a 12.7 oz and it still sets up and runs OK.

You can test your old float. Borrow a powder scale from someone who loads their own ammunition. (You can still load your own ammo in Canada, right? LOL) Take the bowl off of the carb and take the float out while on the car if you can. As soon as you take the old float out and the gas dries off of the outside, weigh it. If it weighs either of these 2 weights then it is good.

The worry is that the float gets soaked with gas ('gas-logged') and weighs more than it should and it will not float right, and your fuel level wil not stay right. But an accurrate weight check (right after you get it out and before any gas soaked into the insides can escape) will tell you if it is good or not.