Turning over but will not start 1973 240z

Generic no-start diagnosis is as follows.

Spritz some starter fluid (carb cleaner, brake cleaner, anything flammable) in the intake. If it starts, you've got a fuel problem.

If it doesn't you've got an ignition problem.

Pull a plug wire and see if you've got spark, ANY spark.

If you do, then you've got a timing or distributor problem. Or lack of compression.

Pull the plug, put your finger over the hole, have someone crank and see if you've got compression.

Pull the cap and see if the rotor is going around.

See if you've got spark FROM the coil. If not, diagnose the ignition.

Inside of 20 minutes you should know WHERE your problem lies.