depends on how far it has gone...

If you catch it bore it gets out of hand you may be ok....but, if a lobe has worn all the way off or the lifter is noticably shorter than others than you know that metal is floating all over inside the motor..... I would atleast do a tear down and inspect.....

I lost a cam in a 454 a year ago and it had and I re-hot tanked it and used the same bearings. They had no metal fragmenting but everthing else needed a good cleaning