Original sprocket sizes

I am replacing the chain on my '81 kz750 ltd (that's an H2 fyi) The current chain is shot after lots of wear and rusting for the last six years in storage. I left my manual at home and was wondering if anyone could give me the original sprocket tooth counts for the front and rear so i can order new ones with my new chain. also, how beneficial is it to convert to the 530 chain over the 630?

ok, well i found the rear is a 32 tooth, so if anyone can tell me the front sprocket that's be great. and any info or comments on the chain size conversion would be helpful too. this is a stock bike with the stock tire and won't be drag raced or anything, so i'm not as concerned about the strength of the chain