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The driver's side dipstick was used in the earlier blocks and some aftermarket blocks (Dart, World etc). Just get a generic dipstick at Autozone off the shelf for a 70's small block Chevy. They are all the same.
Seems like the last GM long block I bought didn't have any dipstick at all. Just a plug for the hole that you didn't put a dipstick in as you had the option for either side.