Jeep J10 1979 engine?

OK I have access to a free 79 J10 pickup in good shape that my father bought brand new but it keeps breaking valve springs and he can't figure out why. He also has an 86 Wagoneer with a 360 in it also and I was wondering if I could swap the Wagoneer motor intot he J10? I know the J10 is the AMC motor but I don't know about the Wagoneer.

Any info would be awesome!!!

Chris