I have recently installed pods and now the 1975 CB550K runs lean at over half throttle. I have researched and found that most people go from the stock 100 jet to 110 jets, which coincidentally the CB550F came with. If I get a rebuild kit for the 550F are the rest of the parts a direct swap?
Afraid your research has failed.
The Cb550F came with 069A carbs, which had 98 mains and a different slide needle profile and position, for the higher pressure muffler it had, stock.
Pods run lean because they shorten the intake duct length presenting closer to atmospheric pressure into the carb throat. This will make any carb run leaner, for no operational benefit. You have to make the carbs richer to restore the proper mixtures that the stock setup had, both slide needle and main jet changes. Raise the slide needle, and unlikely it will need more than 105 mains.
Do use Keihin jets, rather than aftermarket. Aftermarket has few controls over size, dimension, and shape of the parts where metering occurs. Might get lucky. Might not, and then you have an extra mystery to solve why your bike can't be tuned.
Cheers,
