$150 to replace cam bearings? A lot more than it used to be. I remember it being $50 for cam bearings and freeze plugs installed. Buy your own cam bearing tool. Or rent one from local part store and get your money back, so it will be free.
I have one that's only been used a few times, but at $150/pop, it's more than paid for itself. I put my own in. It ain't that hard.