Slow the centrifugal curve to be all in at 2700-3000rpm (you have it way too quick). Then drive it with the vacuum connected to see if you get part throttle knock. If it does, keep removing vacuum timing until it goes away.
Between the timing adjustments, cooler temps, and manual shifting @ 5200rpm you may crack the 13s. Full length headers would make a solid high 13s car.
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