You can use the 75rd drum with the thumhole, plastic dravgunov type stock. You can't put a pistol grip on it without swapping certain US parts for the Chinese parts. That turns the gun magically into a domestic (according to the ATF), allowing you one evil feature 9usually the pistol grip). Imports are not allowed an evil feature.
Mags are not an evil feature. They are just mags. The magazine ban is a completely separate law that has nothing to do with the status of the gun they are used in. Simply put high-caps after 94 can only be made ans sold to LE/govt. You can use any pre-ban highcap in any gun that will take them. Using a 75rd drum in the Norinco is perfectly legal.
Check the AK side of the board for info on US parts, pre/post-ban, mags, options, info etc. You're more than welcome to ask here, and there's plenty of us here as well, but the AK experts spend more time over there. Besides, the AR fans get jelous over our jackhammers that are reliable and clean easy
Come over to the darkside!
Ross