Good day Brent. This appears to be a Galaxie 7-LITRE engine compartment, is this correct?
I have had mine for decades...still a POS, but I like it anyway.
When I got it things were very untouched...worn out, but untouched.
The round sticker was centered on the oil breather/fill cover top.
The air cleaner lid sticker was on the outer rim, flat area. Not on the inner portion like in the photo.
The service sticker was on the drivers fender well, on the outer side of the fuel hose, near the plastic clamp, about 1/2 way between being next to the clamp and the top of the inner fender curve, positioned as to be read from the front of the car, not sideways as if standing with your body against the front fender. But not perfectly aligned either. I was stuck in the general area with some care, but not critical care.
There should also be a round sticker, centered, on the brake master cylinder cover.
This photos I see the air filter lid wing nut is so tight it has bent the lid. For 1966 the lid top is flat, not curved, with a slight recess for the wing nut.
I see other things too but I'll leave that go.