Ok, I've check for spark, then a second time checked for spark with a witness. Spark is strong and purpley and jumping across the gap, which is the right distance.
When I'm holding the starter, the engine does turn over, there is air being pushed out of the exhaust (so my camshaft prolly isn't snapped again

)
We tried starting it with starter fluid (actual starter fluid that I bought from the store, nothing approximate about it), no go, but we did get a reversion that scared me...
I also tried running starting it twice on Thursday. The first time I got two loud backfires,
the second time it started, but sputtered out.
so... what now?