My early '01 has a 53. I'm not positive, but I believe that the first castings showed up sometime in the 1998 model year.
As for the second part of your question, yes there are some 53's out there running fine without a failure. However, you seem to be hearing of more and more cracks as time goes on. I'm not sure that I personally would take the chance on buying another. But, in the same line, I'm not going to run out and sell mine just to get rid of the block. In a way, it's like being in one of those catch 22 situations.