1988 Oldsmobile Ciera Engine will crank but won't start

The car worked fine, but the oil pump needed to be replaced. Replaced the oil pump and saw the timing chain was really loose and worn. Changed the timing chain. Replaced crank and cam sensors. The motor turns over but does not run. Checked spark plug. But no spark. Injectors are getting fuel. Took alternator off and had it tested and it was fine. The control module was tested and it was fine. Replaced the fusible links, still no fire. Other than the cam and crank pointing at each other when setting timing is there anything else I need to know?