383 knock goes away on warmup

Hey All
I have a knock that is only heard on start-up when cooled off or not run for a few hours. it goes away at higher RPM or as soon as the engine is warmed up.

Oil pressure is good (near 80 lbs at idle and over 40 when driving).
I checked the plugs and they are black with soot and wet signaling rich mixture and possibly too cold a plug.
I have added octane boost and it helps but not 100%.

Here's where i am right now;

I ordered a set of plugs one heat range hotter
I added a can of...

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Author: admin