SLANTY BLUES

RAT ROD AL said

I think I saw some flecks up in the combustion chamber of the head. I had some E3 plugs in it. I didn't clean them yet.I'll check em. I had it timed @ 12 * initial timing. And running a holley 1920 with a 56 jet, would uping the jet some help the power circuit? Thanks AJ, I really appreciate your time and help.

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We are all here for you.
If you are needing to drive that deep into the carb then yes a bigger MJ will richen it up.
Detonation does not usually occur at steady state cruising. If conditions are right, it will usually manifest when running deeper into the carb.and at higher load settings, as in acceleration.
Pre-ignition however, can occur at any throttle setting, and usually leads straight into detonation. Pre-ignition is when something in the chamber lights the fire before the sparkplug does. When the spark plug then fires, the two flame fronts collide in the chamber, the pressure sky rockets, and you hear it as a rattle. That pressure spike usually breaks stuff, like the pistons if allowed to continue, and can smash sparkplugs. I guess it could also blow the fire rings out