There is no single symptom that accompanies all conditions of bad timing.
If you have spark and fuel, the last critical element is timing. It is critically important to get the timing right and despite following the FSM and FRSPORT.COM instructions, you can still get it wrong.
I would just check that you have your cams aligned properly again and check the CAS also. In addition, make sure your chain guide is properly aligned.
This comes from personal experience that paralleled yours. I had no popping or backfiring... just slowly turning over but no start. Redid my timing very carefully and got it going.
Good luck.
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Above!!!
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