Need help with TC /flexplate install

Thanks for the answers. John suggested the upgrade to 7/16" bolts so that is what I went with (those ARP bolts are pricey!) New converter is correct for my transmission, everything else is correct. I suppose washers would be the easiest way to go. Would lock washers be ok? Either way, I am loosing thread engagement with this converter.

Also, I have not been able to find any large head TC bolt in 7/16 thread shorter than .50"