If you're changing out the valve I would sawzall the top 3 lines at the bad reversing valve body so that you have the female side of the reversing valve connections still there then in unsweat the discharge. unsweat the top 3 female prices of copper left then clean up your ends. You should have some play in the discharge to start fitting the valve in now. It takes some work to fit the top 3 in but it can be done. Use thermopaste and a lot of heat and braze back together and instantly cool off with a wet rag. You should be good to go.