Look closer and I think you'll see that they are casting number 3782461. If so, based on the date code of F 2 5 = (June 2, 1965) your heads came on:
1965 Passenger, Nova, Chevelle and Corvette 327/250hp and 300hp with 1.94 valves
1965 Chevelle and Corvette 327/350hp with 2.02 valves
1965 Corvette 327/365hp and 375hp with 2.02 valves
They would not be original to your car
Team Camaro Gold Member #14
1967 Camaro RS/z28 - one of 602 made - SOLD
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1969 Camaro RS/SS L48 4 speed
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1979 Camaro Z/28 36K orig miles
1987 Monte Carlo SS 25K orig mi bought new by me.