67 CST Questions for some experts

[Cash3481]

I need some experts to chime in on this truck I picked up. Here's what I know...supposedly!
Its a 1967 CST Large window Buddy bucket with a V6,power-loc rear, No PB or A/C.
I bought it from the original owner. front end, inside and everything seems to have never been removed but the truck has been painted.
The gaps are great and everything closes and lines up real well.
Pics of the SPID are not available, for some reason there is a sticker in its place (pic below).
I have the protecto-plate, owners manual and other documents that I will attach pics of it below too.
SOOO, here is the questions.
1. Is it original?
2. Why is the SPID not present?
3. Is this carbon paper the build sheet?
4. Did these trucks ever come with 17.5X8 rims and tires.?(that is the tire size)

I appreciate any assistance.
Mike