Big Block Rev Limit

['76 Big Block]

Just curious, but since I bought this truck with a supposedly fresh rebuilt 454, and I have no clue as to what was actually done other than rebuild it to stock specs, what were factory engine specs on a 454--- horsepower, torque, and rpm limits.
My guess on rpm limit for stock big block would be 4200 or so, but that's a guess.
My previous experiences have been with small blocks, and I'd heard that the big blocks needed help to get to the higher rpm limits.
I haven't done anything but drive it, and it does run strong, but I'd like to know more about these engines.
Thanks in advance!