Wrong and wrong.... AS far checking the head for warpage you can use a flat edge and a flash light, but a rule of thumb is anytime you take the head off to replace a headgasket is to have it cleaned and shaved. you can take it to Hendrix in Locust Grove 770-954-0301 He has done many of my heads and does good work from what I have used him for.
Break in, well lets put it this way I always drive gentle for the first oil change and they re check the torque specs and then I roll on them. But that is just me because I am pickie on everything .Also Get new Head bolts on that car