I can't see what the other one looks like, but here's the stamping from my 70 LS-5. I believe it to be original.
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70 Chevelle SS 454 Cortez Silver
LS-5 M-22 3.31 Posi Born With Matching #s Drivetrain
Sold New@Baldwin Auto L.I.,N.Y.
LS-5 Registry
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