Real Horsepower of Muscle Cars

All this makes me wonder about the 426 Max Wedge from '63. I believe it was rated at 425 h.p., it had to make more than that especially with the cross ram. and it's a Mopar, not a chevy. However, I do like the Z-11 W chevy engine, I think it had 500+. Can't discount the 427 medium riser ford either, all early sixties muscle.