spark plug gap

Most of us run about .035" on an aftermarket ignition with higher output coil (stock is .028"-.030"). You may be able to go a bit larger. You'll just need to experiment. I would increase gap in .002" to .003" increments until you experience misfiring and hard starting. Then close the gap back up some. I wouldn't run it at the absolute largest you could without those symptoms because as plugs wear, the gap gets bigger. As soon as your plugs wore a little, you'd probably start experiencing the misfire and hard starting problems.