I'm thinking of adding NOS on my stock 305 TPI. I understand I will have to add a considerable amount of fuel at WOT.
Now heres the question.

Should I buy an AFPR and run higher fuel pressure all the time. Or is there some boost activated type thing (similar to an FMU I guess) that increases FP when nitrous is injected?

 

The NOS kits are made to run with stock fuel pressure settings. Any MAJOR deviations, and it's suggested that you contact them for proper jetting sizes.

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1989 IROC-Z 5.7L
NOS 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System