Yes - my 65 GTO built in Pontiac Michigan in September of 1964 has round rivets.
But definitely the exception rather than the rule. The transition seems to have occurred during the 1964 calendar year.
K
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'63 LeMans Convertible
'63 Grand Prix
'65 GTO - original, unrestored, Dad was original owner, 5000 mile Royal Pontiac factory racer
'74 Chevelle - original owner, 9.56 @ 139 mph best
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