Deciphering Original Paint Color - No SPID

[Willys_MB]

Hi everyone,

I'm in the final steps of my engine swap and I'm a little confused. I'm one of those lucky guys who got a pickup that someone decided would look really good in a crappy coat of black primer applied with little to no prep work. While I've got everything out, I decided to at least get a fresh coat of paint in the engine compartment to help everything look clean when I'm done. I started scraping all the gunk out with a putty knife and then I followed that up with oven cleaner and several rounds of pressure washing. I'm noticing a few weird things here. As you can see in the pictures, the passenger inner fender was obviously replaced and it's still rotted out. In addition to this, I'm noticing a white/gray/silver paint all over the truck, but I was always under the impression the original color was teal (light green or something like that).

Does anybody know if maybe that light gray color I'm seeing all over is the primer or is it the actual original paint color?

The last photo is of the grille. Were all GMC grilles chrome or argent silver? I'm also not sure what's underneath that nasty black primer. They even painted my head lights and blinkers, what a nice guy!

Thank you in advance!