I agree that 292 cams and headers would go a long way to give the E9X some much needed power on the track.
The acceleration curves of a 460whp stroker and a 625 kit are identical on the first hot lap, then the 625 kit degrades very quickly. The stroker will continue without overheating for a whole session, every time.
Without going to a stroker, which in practical terms means a rebuild every two years, the 292 cam and a good tune (harder to get than one might think...) is probably enough.
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