First things first: You will have to remove the timing cover again. With a wrench or socket, turn the engine at the crankshaft by hand. Turn it until the marks line up. Then turn it again until the marks line up again to double check. Do they line up?The marks can be a tiny bit off, I allow about 1/8", some people allow up to 1/4" on the camshaft sprokets. The crankshaft needs to be right on center. If they don't line up, you MUST remove the timing belt and realign everything.
When the job is done: If you do take the belt off again, after you put everything back together, turn the engine several times by hand to make sure it is okay. Then put the cover back on.
The camshafts turn at twice the speed of the crank shaft. If you turned the camshaft sprokets around one turn after removing the timing belt, there is a possibility that you are 180' off. In other words, the #1 piston may be at BDC (bottom dead center) instead of TDC (top dead center). To check this, disconnect the battery and remove the timing belt cover. Turn the engine at the crankshaft (with a wrench or socket) with the belt on. Turn untill it looks like all the marks are aligned. Then remove the #1 spark plug. Insert your pinkie finger or a short extension. You should be able to touch the top of the piston.
I don't know if the subaru has interfacing valves, so I give this next advice with a word of caution. If you cannot touch the top of the piston, the timing belt will have to be removed, the camshafts turned one turn, then line up all the marks again and reinstall the belt.