Understand, in the same issue here but our local river is running for the first time in many years. I'll take it for now although it is cooler in the shop.
I'm in. Have rebuilt a few and installed a few. One on the engine and one under the seat tuned to my car. Fun to offer a trial to someone that has not got theirs carb working, what ever it is, and see their smiles.
Get a calibrated scale and see which one is correct. Or get an old one and calibrate it if it is not correct. 6 5/8 inches from the stop of the inserted limit at block hole. Easy, pleasy.
It looks like you have the original model. Some of the dealers have them but are out of stock. A gentleman in Canada is rebuilding the newer, late 31 and will ship them to you. I got one a couple of years ago from him when installing my Mitchel synchronized transmission. Look for information...
CarlG. Living in Alaska you should know the advantage on aircraft. Each tank and the lowest point in the fuel system has a drain valve to drain the condensation from the fuel and what is sometimes in the local FBO storage systems. Always drain them before you take 0ff. The units you show is...
Another way to learn and develop the skill set, which I learned in College as a lab instructor, was to become a teacher of others that have the desire to learn.