Flex plate for 5.9 and 904

DionR said

Could you get the custom converter balanced for the 5.9? Then you could use a neutral balance flexplate.

The other option might be to shave the flange off the Magnum flexplate until it works. I would guess only an issue if the CPS is used.

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i would be afraid to shave the flex plate for balance issues plus I don't have a lathe to do it.
I thought about adding washers in between the flex and converter. Looks like .065 would do it.
I guess I could get it balanced and use my LA flex plate. Unfortunately I would have to ship the converter across the country NY to Cali
and back. My transmission is sitting on the trans jack. Was hoping for a quicker solution.
I am going to call the converter builder and ask about the shims/washers.