Thanks Jay. I found my own answer to the question of the difference between torque and hp. If anyone else is interested here is a link.
Though, I still don't see why you needed the dyno to measure air/fuel. Couldn't you just install an air/fuel gauge and then drive around? I was curious about AWD dyno testing myself until I found out the price. Decided I wasn't that curious. Hope it didn't set you back too much.