with horrible reliability, I really don't think they will be fit as a cargo airliner if they suck that bad..
Actually, for what it's worth, they'll be fine. For a couple of reasons.
First, they will be newer than the 10+ American Airlines retired 767-300ERs that CAM has already converted and placed into service.
Second, IAI/Bedek does heavy maintenance on the airframe while the thing is stripped and opened up for conversion. In theory, the airframe is good for another 20 years once it has been converted.
Third, cargo aircraft generally fly fewer hours (and often fewer cycles) per day than do aircraft in passenger service at a mainline carrier. It's on the ground more, so there is more time to work on it between flights, and it's not accumulating hours (and often cycles) as fast as it would have to at American.
Fourth, nobody gives a crap what the interior looks like. Ever read Flyertalk? In the passenger world, people whine about the stupidest stuff inside the airplane. Freight dogs think it's luxurious if they don't have to crap into a plastic bag "toilet".