66 273 hipo exhaust manifolds and shield factory color?

engine painting was basically like this. for example, exh man were just bare cast iron, BUT they were bolted to the engine before it was painted. the guy painting the engine got whatever spray on the exh man that happened to go there. they were not really concerned with them. the paint would burn off them right. obviously NOT every component was on the engine when it was painted.
I take this info from reading articles years past by people that did this at the factory. ya know, years of reading mopar action! ha...... research the mag and ya might find the articles. it would detail those parts that went on after paint. I am thinking carb, wires, plugs, coil, throttle cable, etc comes to mind?
people now days might paint the man. with a cast iron paint that resists heat, then get some overspray on them to look " correct"?????