Agree with Mr juggler.. Should be 20/50 in the dash pots. Even with worn jets and spindles you ought to be able to adjust the mixture to rich to at least prove a point. Make sure the needles are sitting correctly and Pistons are moving up and down cleanly and smoothly. Had one once where the owner hadn't tightened up the screws evenly and the piston was sticking.
A piece of hose can be used to get an approx equal 'suck' again at least close enough for testing. sU's are simple carbs really.
