Machine 360 crank to fit in a 340 main block

Thanks for all the input. I did not expect the machining costs to be that high to remachine and harden the crank.

Here is another option. What are your opinions? I have seen spacer kits available for using a 340 main crank in a 360. I believe callies and Mancini carry them for around $300 bucks. Any experience with these? I do not know anyone who has used these personally.