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If the chain is not stretched (elongated), use the old chain. It's not so good to use a new chain with old sprockets (inner sprocket).
74k is nothing it will last the double.
Saying that, I replaced my chains when my chains where so elongated that my tensioned almost touched the housing on the left side. It has held up 10-15k miles now, but I think its a gamble...
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Magnus
911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI.
911T Coupe -69, 3.6, G50, "RSR", track day.
924 -79 Rat Rod EFI/Turbo 375whp@1.85bar.
931 -79 under total restoration.
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