I have not dyno'd it, but built a very similar to the one ran on Engine masters 408 vs 408 which made over 490 ft lbs and 438 hp. I put a little bigger cam than the did, and running 1.6 ratio rockers. Cam in the engine now is: https://www.summitracing.com/parts/cca-20-811-9
I never go to the track so I am very inexperienced there, but I took it this last summer. I ran 13.0 with it on a loose 3500 converter, smaller cam, worn radials, and a non-sticky test and tune track, spinning every pass. I since put a bigger cam in, and a tighter, lower stall converter (which the engine absolutely loves).
