Ford 2003 Mustang Workshop Manual page 1256

50. Position the crankshaft with the keyway at the 12 o'clock position.
51. Remove the RH and LH timing chain tensioning system from both timing chains.
1. Remove the bolts.
2. Remove the timing chain tensioners.
3. Remove the timing chain tensioner arms.
52. Remove the LH and RH timing chains and the crankshaft sprocket.
Remove the RH timing chain from camshaft sprocket.
Remove the RH timing chain from the crankshaft sprocket.
Remove the LH timing chain from the camshaft sprocket.
Remove the LH timing chain and crankshaft sprocket.