Are NAND Gate Pinouts a Standard?
I had no trouble finding a reasonable (for that time) datasheet. The TSC301 seems to be a diode-transistor logic gate with open collector output, for up to 15V power, and with 15 mA drive capability. Two of the gates have a pin that bypasses the diodes (connects directly to the base of the input stage).

These features are so unlike the current logic families that you should not blindly substitute anything but the same type, even when the pinouts match (which is not likely, because of the extra bypass input pin).

If you can analyze your circuit you might be able to figure out which features of this chip are really used, which might enable you to find a substitute. But probably with a different pinbout.