I think the original intention of guys swapping the 292 crank into the 250 blocks was to cheat in racing by trying to fool the tech guys with the short deck blocks, and they weren't concerned to much with the consequences of what they were bringing into this type of swap. As stroker pointed out, it has been done by a lot of guys, and even though it doesn't provide the best of design criteria, there are ways you can help make it better, but it can get costly.
