JB weld, flex seal or full rebuild ?

I have the same set-up except aluminum heads. I didn't let my combo get as far as yours did; the ring gap spec in the KB catalog IMO is too tight, and the skirt clearance might be as well. But in your case Ima thinking you also have too much compression for iron heads and whatever gas you were running.
I can't see pre-ignition damage on the crowns tho, so not sure.
I took my engine apart and took the skirt clearance out to about .0035,Which is pretty baggy compared to the spec. and I installed some File-fit plasma Moly rings. I put the top rings in a lil baggy compared to the spec. I don't recall how baggy, but I don't think it hit more than .030
So yeah it rattles just a tiny bit on cold mornings, but she's dead quiet after a minute or two. I cranked up the minimum cooling temp to 205*F, to see if the pistons would stick, but they were fine so I left that stat in there;and that was that.
xxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxx xxxxxxxxxxxxx
My pistons are actually .005 up out of the holes and the Scr maths out to 10.95. With the .039 FellPros, I get .034Q, and with the same cam that you have, installed 4* advanced, plus the Eddies,the Ica comes to 64*, and so the Wallace calculator predicts ;
Static compression ratio of 10.95:1.
Ica of 64* @900ft elevation
Effective stroke is 2.79 inches.
Your dynamic compression ratio is 8.75:1 .
Your dynamic cranking pressure is 178.90 PSI. .................... 179
V/P (Volume to Pressure Index) is 154 ................................. 154
Which is pretty much spot on; I think I measured 177psi. With the all-in ignition timing delayed to 32/34 degrees at ~3400rpm, I can run 87E10 in this, always have, since 1999.
And the engine is no longer tight. I buzz that cam to 7000/7200 as often as I can, but with 3.55s and the 3.09 Commando low gear, first gear pegs 53 mph and the gear splitter takes 7200 out to 68 mph. So that's that!

Ok now your engine, if a true 10.8 Scr, would be running
Static compression ratio of 10.8:1.
Ica of 64* ,@180ft elevation
Effective stroke is 2.79 inches.
Your dynamic compression ratio is 8.64:1 .
Your dynamic cranking pressure is 179.71 PSI. ................. 180
V/P (Volume to Pressure Index) is 154 ............................... 154

Ok so 180 psi is supremely high for iron heads, and very few on FABO profess to run that much with iron heads. I have heard it said over and over that 165 is tops for best pumpgas of 91(R+M)/2 .. So by most accounts your engine should be rattling itself to death. But I just don't see it on the crowns. So it looks like you just need to open up the ring gaps a tad.
Well that and a new set of pistons,lol.

The bent pushrods pretty much have to be from lifter pump up, due to the single springs inability to control the valve train. You better get your valves checked; I bet there are a few bent ones in there. My guess is the pushrods are way too long


Edit for elevation
Static compression ratio of 10.8:1.
Ica of 64*@4800 elevation
Effective stroke is 2.79 inches.
Your dynamic compression ratio is 8.64:1 .
Your dynamic cranking pressure is 155.03 PSI................ 155
V/P (Volume to Pressure Index) is 133 .......................... 133