Re: Blown Head Gasket? Intake Gasket? Worn Valve Guide? 350 SBC
did you break them loose by hand? even if you used an impact wrench you might be able to tell if a few are loose.
usually any SBC will look different/hot/burnt between the center two cylinders because of the two exhaust valves together.
Unfortunately, unless you drain the block you'll always have that anti-freeze at least in the two rear cylinders. it runs out of the head into the cylinders as soon as you break the head gasket seal.
What prompted this expedition to begin with? Was it in uncontrollable overheating? using water? making bad noises?
Looks like a 10.5:1 350, 492 heads and flattop pistons. that's not really a pump gas deal. That engine required premium fuel when premium was 97-100 octane.
Got a better pic of the #7 piston?
Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.