I am trying to get my old bike going. Do i have to change valves out to run unleaded? Someone told me it already has the right valve seats. Is this right for this year?

AFAIK all norton heavy twins with aluminum heads have excellent seats.
Original early valves are probably not as good an alloy as you can now get. I would say, drive it until it needs a valve job then upgrade the valves.

Thank you, is there anything I need to do to the pistons?

"IF" the pistons are 72 original, then they should be the deeper/later cross section rings, which are the same for 73 and all later 750 replacements. They are the good rings....stock late 750.
"combat" is the head and cam, not special pistons....just upgraded stock...

Thanks again Hope to see you on the road soon.