Congrats on what I consider to be the best all-around revolver ever produced. I have one, a 66-2 and one of my sons has a 66-3, his in almost new condition. Both have superb DA action triggers and that's the way we mostly shoot them.
The gas ring location will will date the gun, but even without the upgrade, if you keep it clean, it'll run well.
SS construction for weather resistance, outstanding SA and DA operation, sights that are pretty much the industry standard, and a frame/grip size that allows a 4" bbl'd model weight hovering around 38 oz. It doesn't get any better for all day, all night in any weather, carry, friends. With suitable loads it'll do for precision target punching, or serious social or back country armed encounters. And the .357 round has been a steady, reliable performer since 1935 IIRC.
Best of luck with yours, Rod