340 Static Compression Numbers and Test Procedure
7 and 8 are just pig rich. It's hard to see what WOT is with the shell on the plug.
What intake manifold is that? I'd be looking to do something to correct the fuel distribution issues you have. You have the tune for the lean cylinders, and you have two that are pretty fat.
You need to clean up the idle circuit a bit and the go after your cruise tune up. Once that's done, you can work on you WOT tuning.
Not sure what your ignition timing is and it's a bit hard to see from those pictures but it looks like you got too much total for my tastes and probably a bit too much initial.
Get a magnifying glass and look very close on the porcelain and see if there are any shiny, purple looking balls on there or in the shell. Black specs are carbon and not detonation.
Looks to me (and several others) like the Pistons have had their guts kicked out. I'm pretty sure the rings are now hammered, and any oil getting by them only adds to the detonation issue.
Time to do some very careful disassembly of your engine and see what you have. Before anything else gets ate up.