/// 273 Commando Teardown Help ///
Factory Commando pistons. Yes, you can reuse the factory pistons and re-ring that engine unless you find something wrong. I have an extra of factory standard rings if you want them. Look like original 273/318 head gaskets. How thick do they measure? Keep the lifters in order if reusing the cam. Cast iron is tough to gouge, a standard gasket scraper, single edged razor blade and lacquer thinner should get the decks clean. What head castings do you have? I'd run stainless exhaust valves and skip the hardened exhaust seats. Get new valve springs, good gaskets, seals, brass freeze plugs, and a double roller timing set.
https://www.forabodiesonly.com/mopar/threads/273-head-gaskets.578228/