I have seen this same type of question so many times. The key to your injector set-up is your pump. Nozzle & jet size is all dependant on the pump output. Send the pump to Spud or Hilborn and have it flowed. Then they will ask about your engine, fuel etc. Only then will they have enough info to tell you how to set it up. Send as much of the system as you can. They can check for damage, worn out parts, leaking O-rings, etc. They can also provide instructions how to plumb the system, leak test the barrel valve and service after you get home from the race. Spud has a great tune-up calculator on his website once you have enough info to answer all the questions. Good luck.