there is a nice little mark on the crank pully and on your block for the position... which the haynes manual mentions for the crank: see the picture below

the white line on the pulley is where the mark is on the block to line up the bottom end. you will see a raised line on the block showing you where it is.

2003 Subaru WRX some mods Even if you don't have the answer, you certainly have to admire the problem. aka ZetecRacing