If it's N Registered then it is true that you don't require a type rating to fly a King Air, however most insurance companies will still insist that you do a course at one of the reputable schools like Flightsafety/ SIMCOM etc, it is still essentially a type rating except that you just get a certificate of completion/competency and not an actual rating on your licence as such. I was recently insured to fly a King air as P1, only after I had passed the said course and had ammased 250 hours as co-pilot and over 700 total time, I'm pretty sure that is about the minimum most companies would accept.
P.S If you need somebody to fly it then I'm available as of now
