I know of a low budget 408 with stock edelbrock heads that runs mid twelves at 108-109 with 3:55's and low twelves at 110+ with 3:91's. Our track is 2800 ft and they race during the day when it's hot so the corrected altitude goes much higher.

The engine is in a first gen. barracuda street car with full 2-1/2" exhaust. The engine is about 10:1 and has a performer rpm intake, an old swap meet special 750 afb, stock rockers, a moderate hydrallic camshaft, homemade headers, basically a very mild engine.