You might want to look into doing some Machine work on the heads you have. I don't know how much you can pick up on AFR 185s with a machine work, but it's worth looking into. I've never thrown a set of out of the box heads on a car. I think it's a waste of time. There is so much to be gained from a little port and polish work, and a decent valve job. Not to mention a good O-ring job for peace of mind.
Kurt
Kurt