If you have two cams that open and close at the same exact spots, and have the same max lift, the one with more area may not make any more power down low,
but will make more top-end power, and hold it longer.
The one with less area, will normally be down on power everywhere.
There are some cases where more area doesn't help, but that's not the norm.
Adding area, without adding duration changes the RPM band very little in most cases,
and just increases the power in that power band.
Mike Jones 2011
use .200 as a proxy for area
and to apprpximate Mikes suggestion for seat duration
easy to overcam a low compression motor
so start the way aJ says and then figure out what happens when you increase duration
which BTW not only increases horsepower but narrows the HP range