OEM chain and sprocket sizes??

I am looking to change out the OEM chain and rear sprocket on my '80 KZ750E
I just bought the bike and it needs some work. the chain is pretty fucked.
Ive heard the OEM size is 630x84 with a 32t rear sprocket, but I've also heard 530x106
Does anyone here know?
If not, what is a good chain and sprocket combo to run?

Rear sprocket is 33 tooth and chain is 630 X 84...according to Mother Kawasaki

Replace the front sprocket at the same time as the rear sprocket and chain. This is necessary because a worn sprocket will prematurely kill a chain and a worn chain will kill a sprocket. The wear on the teeth of your front sprocket, even if it doesn't look terrible, makes the spacing between teeth a little different than that of a new chain. As a result, the chain will quickly wear until its spacing matches that of the sprocket, and that leaves you with a prematurely worn out chain. Ed