The fuss about the multilpier pins seem to be a hoax. If it's not a mere hoax, then there's no way around it from what i know. You could always do FSB overclock though it's a huge pain and doesn't have much potential on the current KT133 MBs. Unless of course, you get one of those TurboPLL devices on your MB.
As for the overclockablity of a chip, it's rather hard to tell just by looking at it. You gotta try it hands on.