[Goat Blower]

I take it the 240cc injectors are from an NT? Typically our stock injectors are low impedence and need to use the factory resistor pack, not sure about 240's because I've never heard of anyone using anything that small. The new trick in really large injectors is going to high impedence, in which you'd get rid of the resistor pack. As long as they are both the same impedence(high-low), you should be able to drop them in with no tuning. The 560's you'll need to pull fuel back at low rpm and idle. To swap from resistor packs, you take a stock one and get rid of the resistor and splice all the wires together, that way you can just swap between the two.