Here's some data from EA Pro:
347 SBF: 512hp @ 6500, 464 lb-ft @ 5000, 367 average horsepower, 392 average torque
408 SBF: 539hp @ 6000, 543 lb-ft @ 4500, 414 average horsepower, 457 average torque
427 SBF: 556hp @ 5500, 571 lb-ft @ 4500, 427 average horsepower, 475 average torque
460 SBF: 570hp @ 5500, 612 lb-ft @ 4500, 435 average horsepower, 495 average torque
Now, some caveats: sims are sims....not real data. But the trends work the same as real life.
I used the same camshaft, head, intake, and carb profile in every one of these engines. I started out big so you could see how high you have to spin a small engine to make similar power and even then, you don't get the same peak power, nor do you get anywhere near the same amount of torque or average figures.
Now if I were to bump up the camshaft and valve sizes in those larger engines, the differences would be astounding. For instance:
460 SBF: 638hp @ 6000 rpm, 621 lb-ft @ 5000 rpm, 474 average hp, 513 average torque
