Jetting for WOT is the easiest. If you have a drag strip nearby, just go and jet to the best MPH.
Correct jetting for the cruise is more involved and will require a meter and some additional knowledge of the power circuit. And although this will cause some discussion, an inexpensive narrow band O2 will get you very close.
To be clear, I am recommending the narrow band for tuning only the cruise ratio right now.
