^.....Words of wisdom.....^Yeah...any carb you pull out of a milk crate for cheap at a swap will likely have it's own issues; you may very well have to rejet and get a new throttle cable while you're at it.
If money is a concern, why don't you just remove, clean (what is "yuck", any way?) and rebuild the Mikuni you have on there now and see if that is indeed your fuel problem instead of just randomly trying different parts?
We have a winner......rebuild it the right way, with a US made kit and accelerator pump, and you'll have a completely serviceable carb....set up right, an adjustable main 38mm will feed all the gas a basically stock ironhead can drink....starts easy, and idles fine tooI've had good luck with the old Bendix, if you are looking for something that is relatively low in price.
This would be my choice.....^^I just picked up a "like new" cv at the swapmeet with intake, and cables,etc for 40 bucks. I have heard good things about em.
I would bet if the Good Doctor is really a Doctor.....His bread is Green....I'm going to go out on a limb and bet the Good doctor prefers Rye bread or pehaps Sourdough.