Needles are a whole new can of worms, they is thick for economy and thin for power, you want a tapered one , thick at top and thi at bottom, I never bothered with numbers, just got one that looked about right and filed it to suit, Mini engine very basic, give it fuel and it goes, more fuel and it goes fasterGood job the dizzy I have ordered has vac-advance then. What is on there now does not.
I don't think the carb float/valve is goosed because there is no petrol coming out of the plumbed-in overflow so I guess it must be shutting off like it should. I will put the new dizzy on and see what happens, I think the needle in the carb is BBE/D but I have no idea whether that's appropriate or not. I will hoik it out to check.