Generation IV Internal Engine - valve seats...

I was going to have some machine work done to my L92s, but I started thinking they are such low mileage... Do I have to do anything with the valve seats when installing LS3 intake valves to ditch the stock L92 valves? I had planned on new valve seats anyway but is it necessary? I will be installing PRC duals at the same time, and I have no idea how those are supposed to be set up. Should there be shimming involved or just throw them in and go?? I should clarify, im not actually doing this labor lol, what do I need to have a machine shop do :)

Just lap the valves when installing. You will need lapping compound and a plunger stick. After fully installing valves you can pour a little gas in the cc and see if any will seep thru the valve seat. They also sell a solution (like a dye) that when lapping you can tell if the valve face to seat has a good seal.