Before removing the cams , turn the crank shaft pulley until you have crank shaft pulley aligned on TDC mark, timing chain marks are alligned with DOT on the cam sprockets.
You need to end up with crank pulley at TDC, inlet cam sprocket at around 10 o'clock and exhaust at 12 with the timing chain marking aligned with the DOT on the sprocket. Its takes a while (turning) to get everything aligned.