Just as a follow up after this abuse, I checked the Pantera for wear etc. Tires looked ok. Clutch hole showed a considerable volume of clutch powder, so I probably wore the clutch quite a bit. The plugs looked fine, no sign of any overheating despite repeated high rpm runs (NGK "9" race plugs). And last but not least, took off the valve covers to check the valve train, nothing to report that I could spot.
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