Very problematic design with a troubled operational history.
In theory it should have been the equal of the B-17 but the lousy engines. I honestly dont know how many PE-8s were built but it wasn't a successful design. Not helping matters was the lack of enthusiasm for strategic operations in the Soviet air force, which was virtually 100% a tactical air force.
Its contribution to the war was nothing compared to the TU-2, which was a far more versatile and capable airframe. The TU-2 could fill several roles in AH and since we dont get new bombers often this needs to be considered. The TU-2 had almost the payload, was far faster, was more nimble, and could fly a variety of operations in the game. Strategic, tactical, maritime, and its "almost Mossie" speed would make it a great raider.
http://www.aviastar.org/air/russia/tu-2.phpThe PE-8 would be so one dimensional compared to the TU-2.