This is only a guess, 50 -52 horsepower if you are lucky. You will need at least a reamed out model A manifold and model B carb to realize the potential of the cam and head. The stock B eingine was, I think, 52 horsepower. The B engine had the larger manifold and carb plus the nos cam. The stock B engine only had a compression ratio of 4.6 .The police head has a ratio of 5.2 and this should give a little edge. Remember it is not a nos B engine and my guess that if you made the carb and manifold changes mentioned I wouldn't expect much over 55. Good luck, I think it will be worth the effort.
I don't ream the carb. I ream the runner of the model A intake manifold to model B size. Some have problems setting up the manifolf for boring. If the manifold is not properly set up, some have ran out the side and ruined the manifold. I use adjustable reamers and ream by hand. Hand reaming is a slow process but It has worked well for me.
I installed a stock model B flywheel on our roadster. I weighed both flywheels, the one that I used was 16 or 18 lbs. lighter . It really made a big difference in throttle response and acceleration. A dual updraft manifold with good B carbs will probably add another 10 horsepower if used with a higher compression head and better cam
I'm not sure of exact crankshaft weights. There was three different crankshafts used with the B engines. The B engines produced in 1932 did not use the counterbalanced crankshaft. The early crankshafts were heavier than the model A crankshafts because of larger bearing journals. The forged counterbalanced shaft was heavier and the BB shaft with pressed on counterweights was the heaviest.