Did Factory Undercoat the Fuel Tanks?

Here is a non undercoating 63 Valiant.

Looking down the underside of chassis you see bright spots where there is not full undercoat.

BUT the wheel wells are still blacked out with undercoat for corrosion resistance, noise, and visual appearance.

NOTE muffler does not have tailpipe installed.

I see a pic of a 67 Fury C-body with tailpipe installed on drivetrain jig. Another Cordoba pic with the tailpipe sitting on the jig as if to be installed near the same time as drivetrain.

Seems like tailpipe install varied per car and possibly option (duel exhaust, muffler configuration, etc)

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