Ok so here are a few pics of my flex plate.
The comp engineering spacer is already in and you can see that the Mopar performance flex plate is just flush with the crankshaft pilot.
The other pic is my Turbo Action 8 inch converter. You can see that
The snout from the converter is just starting to engage the crankshaft and and the drive lugs are not yet touching the drive lugs. So there is plenty of engagement for everything to work properly.
However on close inspection the stock Mopar bolts with the spacer in there are in fact just a little short, and could be just a little longer.