Found these little charts in an old issue of Iron Horse recently and thought they were worth sharing. There is a lot of bullshit (or widespread confusion as they call it) talked about how to measure how much "over" a front end is, this should clear it up.
I have just been sorting out a few old Amal Monobloc carbs to sell off and found this website that gives all the carb numbers and original applications. Never realised that Monoblocs had a date code on them before. Living and learning....