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Here is an interesting theory, but potentially irrelevant :-)
Gap makes a HUGE difference in older cars. I have a 351 Cleveland in a 1972 Pantera. Changing the gap from the traditional 35 thousands to 45 thousands yielded a LOT more power. Mostly due to the modern MSD ignition that can handle the larger gap, but just that would easily account for the equivalent of an "S" vs a base in power...
I know the plugs come "pre gaped", but may be worth comparing the NGK's to the new Bosch?
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2000 S - Borla Exhaust, TS Cat Deletes, RSS UDP, B&M Short Shift, T96 Steering Wheel, Potenza RE-71R's,
Mantis 2.0L Deep Sump, de-snorkeled, Bilstein PSS9 Coil-Overs, Rennline lug studs, and auto crossed regularly.
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