The big bracket is for the power steering pump. It bolts to the bottom of the pump with the open end of the Y upwards and the lower end uses a single bolt on the timing cover. The alternator adjuster bracket goes through the open Y and on to the alternator.
The smaller bracket is indeed for the fuel filter. It bolts to the passenger side of the block up by the head and bellhousing. It only fits one way so it shouldnt be too hard to figure out.
