Yeah, I agree, .035 would be good on a 235.
Staying on topic without pettifogging, this is from the old guys at Champion Spark Plug Company. Interpret any way you wish.
"Gap Spacing — With increases in gap comes an increase in “start up” voltage, but the “lock in” voltage remains relatively the same regardless of gap. Example: fluorescent light — a 1′ long bulb or a 6′ long bulb use a very similar amount of voltage to keep the gases ionized but the larger bulb requires a substantially larger voltage (ballast/transfmr) to initiate the ionization."
