Re: 74c14 sub

Yes, you can. It's the number 7414 which tells the purpose of the chip.
The C-letter means it is cmos-type (and it needs to be in your circuit,
as you mentioned), and H means it is high-speed-type. It is not
mentioned to be necessary in your circuit, but it is ok to use the
high-speed type, although not necessary.

ps. according to the data***, 74HC14N is Hex Inverting Schmitt
Trigger and 74C14 is Hex Schmitt Trigger.

Both ones are inverting. There are mistake, or maybe the maker of the
data*** of the 74C14 has considered the "invertingness" a "special
feature" which wouldn't be necessary to tell on the header.

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