350 chevy cam problems

[threeonthetree]

i have a 350 its been sitting for a while its in a blazer. its my dads truck, my uncle brook something on it a few years ago. my dad said there that it was a timing chain problem. but he never worked on it. recently i picked up a wrench and took it apart. i found that the cam is snapped in 2.it snapped only a little ways in after the timing chain. i was wondering how this could happen, and if i can just get a new cam. or if i need to replace the rods and lifters?