Keep in mind what Mitch mentioned. "there's a lot of things to consider" It's the picture, getting everything to work together and efficiently. such as a full flow system with a remote cooler and fan, remote oil filter, timing and jetting properly set, good sealing from exhaust into engine compartment, good air circulation into engine bay.
I can go on but I think one would understand where I am going. the initial engine combos available had been a stock crank with big bore and stock valve heads. it wouldn't matter how big of a cam you ran, the small valves and ports would choke the motor's power and efficiency.