Crankshafts

OLFOOL said
Can I fit a 360 magnum crank into a 360LA block, I have looked around for info but have seen that pistons and rods in a magnum are lighter but thinking this could be overcome when balancing the parts? Basically use all LA internals but magnum crank. Any help appreciated here in Australia, :)
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Depending on the weight difference, putting OEM LA parts on a Magnum crank may require Mallory metal (expensive) if enough material can't be taken off of the LA pistons & rods. Aftermarket pistons & rods tend to be lighter & stronger for either application.

Does the LA crank need to be replaced?