'98 Malibu broke cam 3.1

My daughters car quit on her right as she got on the freeway. Got it towed. When I tried to start it, it sounded like it had jumped timing so I tear into it only to discover that the timing marks where correct. Well I slept on it and figured it had to be a bad cam so I took the front valve cover off and turned the motor over to find only the first three rocker arms on the front head were moving. So I guess her cam broke in half.
My questions for anyone who has experienced this before is:
did this damage the cam bearings
can the cam be removed without damaging the cam bearing
should I get a junk yard cam to replace this one if it can be removed
is this an interference fit motor ie.,are the valves bent(haven't done a leakdown test yet)
any sugjestions from folks with similar woes

Thanks in advance, Jim

it is not unheard of on the 3.1 liters

Get a used engine!