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Why have you chosen this particular device? Do you really need a bipolar, military-grade device?
As far as I can see, the '674 is not really designed for cascading. You can share all inputs and the SER/Q15 output, but use /CS to address them separately…
Select this link to see answers to common questions, detailed use case implementations, and part recommendations for logic and voltage translation devices. .
Top Logic and Voltage…
FAQ: Logic and Voltage Translation > Input Parameters >> Current FAQ
This question comes up fairly often because the HCS logic family is specified only at 2V, 4.5V, and 6V.
The following min / max values are interpolated from the datasheet tables…