I'll try and keep it simple cause i have a hard time explain'n it.

The 226/234 duration #'s are the degree's the valves open and close in relation to crankshaft rotation.
Higher the #, the longer thier open.

The factory low perf cams start about 210.
Every 10 #'s higher rises the rpm power range "about" 200 rpm's.
But you also lose the same amount at the cams starting power range.
Doesnt sound like much, and isnt till you get to 225, then you need more gearing to get engine into higher power range.
Generally the smaller the bore and stroke of the engine, the more gear you need to accelerate vs a larger bore and stroke engine.

Then there's lobe separation. It complicates things.
Generally the wider(112-118) the lobe sep, the milder the engine idles, and it also has a smoother, wider power band.
104-108 lobe sep's have a narrower power band, and idle ruffer.
Especially in a small bore/stroke engine.
110-112 lode sep is a good compromise for idle quality vs power band.

A 224/236 cam in a 350 gives a ruff idle with high end power, but with a low end power loss.
In a 455(larger bore and longer stroke), it idles fine, and the power level will be lower.
There's more to it then what i posted, but hopefully this gives you good idea.