yo bro,
i have a 1979 cb650 that i successfully put pod filters on:
http://www.flickr.com/photos/10396190@N04/3433248288/
it runs pretty fuckin good.
for the cb650, the 79-80 carbs are "piston" type carbs and the 81-82 carbs are "CV" type carbs. They unfortunately are completely different...