I'm 6'2", 247.5lbs, approaching 44 yrs old, close to 30% bf.

My BMR= 2839, total calorie intake to maintain current weight ~ 3900

My goal is to increase muscle mass while at the same time reducing fat mass. Do I go with the 3900 calories or should I reduce it and if so, by how much? I'm in the gym 4-5 days/week with weights, no cardio. I'm not concerned about dropping the fat mass quickly, gradually is fine with me. Assume I am not going to do cardio. I've got a buddy of mine who owns a nutrition shop and competes in bb'ing contests drawing up a diet for me. Proteins will be fish, chicken, eggs.. no beef.