poly crank shaft

the register can be bored out in a lathe to 727 snout dim. the flywheel bolt pattern is same, years ago, mopar wanted you to use the 318-3 truck crank in the 273 and 340 for racing, since it was chem hardened. I've done 3 of those registers in a lathe!!! sad to say weight is about the same as a 340.