Anything that fits that year range 750, K, or C, or F does not matter, bigger off 900 or 1100 will work but harder to, the 1100 ones do not have the primary main system that a 750 needs to work right. The carbs being CV type do NOT respond well to pods or any other air filter than OEM so expect trouble doing it.
Run the valve clearances, most of the time the carbs are off due to problems with the valves leaking.