My lx not getting spark. replaced distributor, main relay and cranksensor. Help?

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I did a head swap and it ran after, but now it won't start. Replaced distributor, main relay, did timing, and replaced the crank sensor. Any idea what could've caused this? By the way I also have good ground connections from motor to body. I even tried holding the spark plug wire to the negative terminal if the battery with a screw driver in the spark plug wire. No spark at all. Wires are also new