Ha.. pfft. I know nothing about it other than what I've read and experienced.. If it feels close and you just want to confirm best method is probably to index the throttle and go and rip a few plug chops at varying throttle positions. From memory scotties was setting their Euro models up with 42 N3EJ#3 178 after setting the floats a touch lower than stock. I'd say its fairly safe even if the pipe did lean things out a bit. Especially if you haven't increased the compression ratio or tightened up the squish (IE stock engine). For me I just say the jetting is right when it feels right, and come to this by experiencing what is too rich, and what is too lean.
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