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These are the ones I used. They will dissolve in cold antifreeze after a while, but I would do plain water while running the motor in (30 minutes) and then drain and refill.
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In a glass jar, yes. I doubt that a film will remain inside a hot block with anti-freeze though. I haven't found any residue at all when I changed the thermostat out after a few weeks of running the first time.
 

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Somewhere around 1989-1990 (?) the 258 block casting profile was modified for the introduction of the 4.0 leaving the outside of the block straighter. This is easy to see and can be felt when placing the newer head onto the block deck. If you can see the triangle ports with the head sitting in place, you WILL need to seal the overhanging ports.

Peanuts are the only cheap, reliable way to plug up the runners so that the JB Weld or Devcon doesn't dribble down towards the valve stem. Once dried you CANNOT get the little suckers back out, so dissolving peanuts are the trick.
 
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