Is this right ?!?! 4" cast crank

I don't know.... by the time you buy the special 408 pistons, machine your block, either modify existing 360 rods or buy aftermarket ones, balance it all and spend a bunch of cash on the rest of the engine why would you put an unknown bent and then straightened cast crank in it. The cast 408 cranks are known to break at the front throw, ask me how I know.

Honestly, by time you buy it, straighten it and turn it why wouldn't you just buy a forged one new and not worry about it?

IMO it is a boat anchor, and not a very good one as it is too light.