Stock main jets are .098 and 75/47 Rods. Which is 23/51 (Im getting this by subtracting the metering rod sizes from the jet size). Which is the actual orifice opening either at cruise or power. Correct?
Well it's the open area size you must calculate:
.098 and 75/47 gives you an open area of 31/58
.092 and 68/42 is a bit leaner and gives you an open area of 30/52 (actually 52.6)
Anyway thats theory and the AFR-meter and driveability gives you the thruth (at least almost, nm9stheham explained it very well).