My trac was a "starts fine, runs fine", but gutless.
New plugs, proper gap, proper time, and jeez it actually does have _some_ ballz.
Consdering all that was wrong I would thought it woulda run like crap, but it "componsated". Which is another word for "masked the fact it was totally unmaintained".
Anyway, I can see how STRONG spark will help tremendously. I think from about 3K and up, consistant spark (at time) is KEY.
I was able to tell from a timing light that idle was sparking fine, but at 3K I had a miss (bad cap/rotor in my case, but that's a symptom too). Even with a good cap/rotor I expect the stock ignition would "miss" here and there. At 3k or 4k rpm you might hardly notice a 10% loss, but that's the power band, and getting 10% there is what you WANT.