I don't know what y'all are talkin' about as far as marks on the backing plate and on the back of the belt cover.
The marks to use are:
Cam: there is a triangle embedded in the front edge of the gear. It is aligned with the pointer that is at about the 4 o'clock position, which would be visible externally if you removed the plug from the timing belt cover.
Crank: the engine should be at TDC. There is a groove for the woodruff key that should be at the 12 o'clock position. When the pulley is mounted, the timing mark would be at about the 2 o'clock position.
Aux: no marks that I know of. If you have a distributor, the rotor should be pointing at the #1 plug wire.

If you have it all put together, turn the crank to line up the timing marks to TDC. Remove the rubber plug on the belt cover, and look for the triangle to line up with the center tic on the pointer. If you have low power, you may have set the ignition timing incorrectly, for those that have a distributor.
tom