Cam HP capability

From the detail you're asking for, it sounds like the selection is based on "experience", not a mathematical or mechanical physics based formula...would that be a fair summary?

Comp will be 10:1, street use mainly with some strip, power brakes, Magnaflos, I want a solid flat tappet auto with 3500 stall, 3.9 gears small tube full length headers, I use a high grade mineral oil. 25-50 (remember it gets hot down here and rarely below 45F)