Looks silver to me. Might be faded IDK. This one is off the parts car, October’69 SPD. I'll have to locate my other one, but I think that one is from '71 or '73.
in daylight:
Garage light:
I think a speed nut is attached to the larger post from the back of the fender. I can't tell because the post on mine is broken off. You might be able to use a barrel clip that goes into the hole first so you can push the Pentastar in from the outside of the fender.
Correct one for your car is plastic:
NOS MOPAR PLASTIC PENTASTAR RH FENDER 67 68 69 70 71 DODGE PLYMOUTH HEMI NOS | eBay
Or you can go the Restomod look and get metal :poke:
1963-1966 Chrysler Lower Fender Metal Pentastar Emblem 2495798 NOS | eBay
From what I remember on my '73, the heater core is only accessible from under the dash inside the car. I think it can be done without removing the dash, but it is a PITA. I do believe you still have to remove the heater blower box from the engine compartment as well. Does the FSM have...
Damn, reality check is such a buzz kill, but of course @Big_John is right. I've been down this road before and the frustration of not getting to a project is greater than missing "the one that got away". You will probably get greater satisfaction knowing it went to a good home.