When I design a combination and pick cams, I simply use some good engine software. If you call a cam company they will do the same thing. I use Performance trends, it is reasonable in cost and has never been wrong on predictions when I put the engine on a real dyno. Not only will it give you HP and torque it will give you cranking compression, idle vacuum, timing curve for what ever octane fuel you input, cranking compression, and the list goes on. And of course it is like any other program you have to input good numbers.