NOS and Spark plugs?

Sounds like you'll be fine with the inline pump. You still may want to stick a bigger pump in the tank too....but that's just my opinion. The Hobbs fuel pressure safety switch will shut off the flow of nitrous into the motor if there isn't adequate fuel pressure & volume...so you'll know if the inline pump is pushing enough or not. Which inline pump were you going to go with? How much does it flow? I don't think you don't need the 24lb. injectors though. Were you going to get those because of the nitrous? Unless you have aftermarket, better flowing cylinder heads, bigger cam & better flowing manifold...you don't need 24lb. injectors. From looking at your sig. it looks like you are still running the stock heads, cam & intake, right? If that's the case...the 19lbers will be plenty.