Only the 1972 intakes had the crossover heat shield riveted on.
The 1969-1971 intakes and crossovers did not have any rivets.
There are several visible differences between NOS and repro intakes.
The most noticeable is that the repro intakes have a raised, oval area around the casting number, as shown in the first picture below versus the NOS intake in the second picture.
Port sizing is much closer on factory intakes than on repros, although the later factory intakes were sometimes sloppy.
Good luck!
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