The act of congress said a couple million dollars could be minted, but only 316,000 or so of the peace dollar design where minted. What were the others supposed to be?? Morgans???
Without researching it, there is a vast difference between "could be minted" and "were minted". Pretty sure they were all going to be Peace Dollars...
I'm Sure Daniel Carr will be making inquiries - he's already created some 1964-D Morgan 'fantasy pieces'.
The subject was discussed at length in Q. David Bower's Offiicial Guidebook to Morgan Dolars (5th Edition) by Whitman Publishing
I have been told, by an extremely reliable source, that there is at least one '64D Peace dollar out there... He saw it.