Mileage on Cam Bearings
What exactly do you mean by freshen up the bottom end? If you are thinking about doing what I think you are, you might as well drop the motor and do a full rebuild...you can't simply pull the crank and install new main and rod bearings, you need to get the block machined.
Your rod ends and mains will likely be slightly out of round. This will only accelerate wear on the new bearings. If you are going to get new bearings, you need machine work, simple as that. You can "get by" all you want, but I prefer to do things right.
But sometimes the difference b/t doing things right and getting by is several thousand dollars, and in an engine that was running fine before and they just wanted to "freshen up" as a preventative measure they will be fine. Yes you can argue that the rod end may be slightly out of found all day, but the bearing will conform to the surface as long as its not really distorted, like I said, if the engine had an exhisting problem this would not be a good idea and would buy a few hundred miles at most, but in a good engine it would be fine.
well i've seen it done and the cam bearings are smooth but not silver they are copper in color .. they dont look like they have had hazing or burning like you would see by metal to metal contact ... it is a 80k long block and i wanted to change them out just to be on the safe side while my other block is getting fixed.... and that will be awhile as it is costly but if i can spend a hundred bucks to insure that my bearings dont go down them i will do that because i wana drive my car while i can till my motor is fixed the way i want it... can i just pulled the crank and put it back together with the same bearings aslong as i retorq them o specs or i am budget minded and i would love to just have the cash to throw around but ... i''m poor 
I guess you could pull the crank and replace with the same bearings, but I wouldn't. P series bearings are only about $40 for a whole set (main and rod) and as long as you verify they have the right clearances just throw in a new set and torque it back down. From what you're describing from the wear on the bearings I would def swap them out, it doesn't sound like normal wear.
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