Idle went nuts.

Well - here are the results in pictures:
1) you can see the damage to pistons #1 and 3 - there are scraps of the washer in #1 and the entire nut in #3. The scraps in #3 are bits of spark plug. I found the bolt, complete and undamaged in the intake behind #4
2) cylinder #1
3) cylinder #3
4) plug from #1
5) #1 chamber
6) #3 chamber
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Is there hope or am I shopping for a new engine?
Check the valve seats and valve face on the effected cylinders, then if they are good and the cyl walls aren't all gouged up, put it back together and drive it.