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On the timing plate; the lower notch is zero reference (the "0" in the metal). The second notch up from there is 10 degrees advance (the "10" in the metal).
I usually use AC Delco plugs so can't be sure about those you have but they sure look long, are you sure they are the correct ones for the 455? As far as how they look, they look pretty normal to me. They sure don't look like they came from an engine that has been running hot (at least for a period of time anyway).
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Dan
'77 Cutlass Supreme
'46 2 door
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