Something to think about.............they were cutting down 440 cranks to make 451's long before they started to make specific cranks for the build........I never heard of the cut down cranks being unreliable....actually you will pick up a slight improvement due to the ground fillet radius on the main journals (that are stress reducing) rather than the rolled groove (that are stress inducing) journal fillets.
If you are super paranoid, you can have the block line bored to except the 440 crank as is.....IF you can find a shop that can and will bore the block that far......reference "Mopar Action" Eherenberg's "Project Bold Beeper" build.
