I can do plain and blocky , although I'd recommend varied font and font/size if you really want to match older Nissan motors. Even the S20 motor, which could be considered the closest cousin to your creation had a Serif font and an outline font (albeit blocky on both accounts).
Also, as far as I know, most Nissan motors said twin cam 24 valve, not DOHC. That's more of a Honda/Mitsubishi thing...