With gasket on, you can still verify cam-timing alignment from other side of engine. Note dash-marks on both cam-gears are straight and lined-up with top of head:
Test for spark.
Pull plug-wires and insert spare plug. Ground it to engine valve-cover and crank, do you see spark?
Could be any number of wires got disconnected when engine was removed.
1. measure resistance of pickup-coils at coils themselves
2. measure pickup-coil resistance at ECU connector
Could also be a power or ground wire's disconnected somewhere.