Looks like very good power from small ports, smallish-cam, manifolds, stock rockers, etc. Aside from the dual quads, it actually sounds like it would be a similar combo to the 1961 360HP 409's. The TQ peak shown is at the first point of the sheets, so it probably made more down low. I also noticed that the HP was still climbing @ 5600 where the test ends so it may have made a little more up higher. I think it was wise to not turn it up higher just to see, given the stock rockers, etc. I doubt you'd see any more power from a 454 with small port heads, small cam, and stock exhaust manifolds.