For the TransAm 305" rule, the Mopars ran a 340 block with destroked crank. They didn't run 'em to 10,000 RPM, though. Sorry I don't recall the crank manufacturer. There were some CanAm 305s built too, for the Shadow team; I remember them being painted black (as were the cars), and they may have come from Keith Black like the T/A motors did. They ran fuel injection as opposed to the carbureted T/A setup.