/// 273 Commando Teardown Help ///

The head gaskets should just pull off. If they are stuck, there is another clue that they are not originals. Pull them off and you can use a gasket scraper or putty knife to get under them it won't hurt the deck or heads.

https://www.forabodiesonly.com/mopar/threads/273-head-gaskets.445994/
Get the heads surfaced, the guides checked and repaired if/as needed.Get the valves and seats ground. New valves may be needed. Have the springs checked or replaced as needed. New valve seals of course.