So, a few more pics of the first carb disassembly.
First off, I open up the fuel intake filter and all this falls out!! Yikes
Then the butterflies showing some soot on the barrels, even when closed:
Jets (including more dirt):
Left to right, idle jets are 58s, mains are 175s, starter emulsion tube 80 (with free debris!).
Floats look very old and worn.
The fully open position looks about right but the 'full' shut-off position looks a bit high, so will check and adjust this later.