So it sounds as if I was finding TDC correctly, and yes, it was a tooth off. And I do not need to regap the valves.

Now, I don't hear any bad sounds when I try to start it without ether, so I was sort of hoping that the sound was because of the explosion happening. I will try to record this and post it to youtube, and you could listen to the sound and see if it seems like a real problem.

Also, I will look into fixing the injector timing - I'm reading through it now.

And I will mention, I haven't entirely spent time bleeding the injectors, because I've been mostly moving really carefully through setting it up and getting it ready to start, listening to the sounds of it as I try turning it over.