Bore to Stroke Ratio

To the OP a lot of the info you will come across is more for racing 7000-9000 rpm engines not that we can't use some of the info. Bore size is the limiting factor when it comes to NA power cause that limits valve size which limits air flow but unless your building something crazy it not gonna effect most of us. Eg. 273 would be the smallest bore most of us would deal with and most of us should be able to get 400 hp or so and good builder who knows but 500 hp at least should be doable. With 318 or bigger bore the strength of the block be a more limiting factor. As for longer stroke the less rpm you'll need to turn to make the same power but over a certain ratio friction will be limiting factor but for most of us who generally wants to make peak power in the 5000-6500 rpm range it a fair trade off.

I think of cam and heads as the amount of power to be built and displacement is at what rpm's it will happen, obviously there's bunch of variables, more efficient the build will need less rpm than a poorly built engine.