FB25 crankshaft timing

Trying to figure out how to align the crankshaft timing with the sensor. Should it go in position A or B? This replacement engine was in position B and barely ran. It was throwing several codes related to camshaft and crankshaft timing, and would bog down and stall if you gave it gas. 2011 Subaru Forester 2.5 FB25 engine (not entirely sure what year this replacement engine is from) edit: It should be in position A