I am pretty new to Turkeys myself. But I recently purchased a young Jake ( Spanish Black ) and a Royal palm hen. Both were raised with not only other turkeys but lots of chickens of different breeds, sizes and ages. I know Blackhead can be an issue. I quarantined mine and then slowly introduced them to my birds. Haven't seen any issues but I did deworm the entire flock together after I introduced the turkeys. I also ordered the antibiotics needed to treat Blackhead should anything occur.
So my advice would be do it slowly, and order the items needed should an emergency occur so your not waiting for things to arrive, and possibly wasting precious time that could save a bird.
Good luck! I just placed my order for 16 of Porters Turkey Poults I'm already liking them more than my chickens...but don't tell my chickens that.