Theoretically, it is possible. However, if it did turn out to be the original heads, I believe it would be the first known example of an 041 head on a Z/28.
I tore down a L48 in a 69 Impala that had one 186 head and one 041 head, and still had the factory steel shim gaskets with no sign that it had ever been apart. That was in the mid 90s. However, as you know, the L48 had 1.94 intakes.
I don't believe there has ever been a documented case of an 041 head with 2.02 valves from the factory. Quite a few have been modified for 2.02 intake valves. You might try a boroscope, but it would be really hard to tell if the head was machined for 2.02 intake valves from the factory without pulling it.
The date would make one believe it is likely original to the car. Hate to say never.
What is the assy date on the engine? Does it predate the D25 9 head? If so, most likely both heads were replaced at some time.
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