[DeTomaso] Engine Autopsy

[sean mundy]

A few weeks ago I posted about my engine making a sudden rattling noise.  
I posted a picture of my damaged #4 spark plug and guessed that maybe the one of the valves had dropped into the cylinder causing the damage.   
I removed the head this weekend and here is what the valves look like.
http://poca.com/index.php/gallery/?g2_itemId=34768
The valves are where they are supposed to be but something caused the surface damage to them.
Here is the answer
http://poca.com/index.php/gallery/?g2_itemId=34771
It appears that my aircleaner wing nut came loose and the center post that screws into 
the carb also came loose and ejected itself down the carb, manifold and finally into the cylinder.
Any advice on what I should do now?
Total rebuild or clean it up and put back together?