With my tune, I never drop below 20* spark advance. Would it make sense to rotate my dizzy to, say, 10-15* base timing in order to align the cap&rotor more closely when PCM fires the coil?

What say ye, regarding startup cranking and whatnot? Any reason not to use 20* base, or even 25*??

My plugs are glazed and I've had awful misfire problems lately (not a major concern 'til it recurs). I happen to have a new set of delco iridium vortec plugs factory set at .060, which is a way bigger gap than stock TBI speification (HEI). I was previously using the copper vortec plugs gapped to .035 or so.

The .060 plugs work, but I worry the larger gap could spell trouble for other ignition components down the road.