To shorten the slots, it depends on the distributor. A stock distributor you typically have to weld the slots partially closed and slowly open them up with a die grinder or file. Aftermarket distributors usually use bushings to limit travel or have an adjustable tab.
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i think if he thought he'd get more power by shortening the distributer slots then he would have done it.
Don't bet on it. Ignition timing curve seems to be black magic to most of the guys that come on here. So many guys come on here complaining about carb problems and spend hours fiddling with it even after being told on here they need to sort out their ignition timing FIRST.
