I am sure you are right on that. what pieces that are left on my 72 318 car look just the same. they are as rusted out as the 340 car. Those manifolds must have been early takeoffs that were kept very well. Now that is solved will take a little detective work to figured out how it was finished on the engine. My first guess not taking my engine apart is the engine was assembled and painted blue with the "normal overspray you would see on any engine detailing, manifolds, negative battery cable etc. Heat shield Gloss black and installed after engine paint along with heat stove which was gloss black also. This will only make sense if the shield will fit after the manifold is in place. If not then it had to be install with the manifold and would receive overspray.