MAF noses over at 6300. It looks like an airflow issue. What intake manifold, t-body, CAI? Looks like a healthy 408 with a stock LS1 throttle body.
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You can't command a stoich ratio of 13.3 if the fuel you are running is not that. The stoich ratio must be correct for the fuel in the tank, there is...
deck height is 9.800
head volume 102cc maybe 103cc now because I checked my cc and after when I built the engine the pointe of the heart was hitting...
Local buddy had one very similar back in the early 80s. It was the most basic 11.90 street car you could imagine. A literal tin can on wheels. Solid...