I am planning on installing my N-1K, with the following modifications, F-150 crank pulley, custom discharge tube w/ a bypass, and a larger mass air meter. My engine is all stock right now but before I install the blower I want to put on headers, 1.7 rockers and an intake spacer. I will be using a 225 in tank fuel pump with an adjustable fuel pressure regulator and the supplied FMU. My question is how far can you go using the 19# injectors? Future modifications/up-grades will include an aftermarket intake manifold and a larger TB, would the 19’s still work, and be safe at this point or would this be the time to invest in larger injectors and calibrated mass air sensor? If I buy a larger mass air meter now for the 19’s, and later need to buy another one calibrated for larger injectors then I have just wasted money and time. If I should go with larger injectors now how big should I get? All input is appreciated.