Mike,
It seems like you're doing all the right things, but to go with the new plugs, I'd spring for Bougicord wires, plus Bosch cap & rotor, especially if those items are of unknown age.
And I'm not sure the platinums were necessarily fouled. The gas odor may be due to lack of driving. And the color sounds pretty normal.
You might try for a JY coil, if plugs, wires, etc. don't help much. Most places will let you return it if it doesn't do what you want.
Bruce
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Bruce Young '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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