Most "modern" engine shops won't even unload a flatty off your truck but there are many old timers around that will work on a flathead though it is a dying art and most young people want to work on newer stuff. Thankfully you are buying a later version flathead with insert bearings. I can't imagine the trouble it would be to find someone to do poured babbit bearings. Atleast here in the northeast. Those guys retire and no one wants to learn what they know.
You have come to the right place to have all the of the knowledge of Flatheads and vehicles that you could ever want. Good luck.