I have never heard of one catching fire on its own (I am curious the alloy they used), but if there was a fire it would burn very intense. CO2 extinguisher and water would both make it much worse. Need a dry chemical extinguisher.
@replicaracer43 do you know if the intake is aluminum or magnesium? it looks aluminum to me. After sitting so long I would imagine it would have taken on the black oxidation by now if mag
according to this, 1965 casting would have been magnesium and 1964 aluminum yet.
Race Hemi Crossram Intake Manifolds