Just to sum it up so I make sure I get it right:...
2. Blue initials on driver's side (looks like a "TC" and a backwards "3") but should only be 2 initials.
I've only seen numbers applied in that area - this year and application. Can see the 3 at the face of the third member (right side up from certain angles) and a possible 31 higher up on the side. But if I flip the picture up side down I do see a TC. No telling if that is what they wrote or meant to write. Good thing is you have the original example to reproduce when time comes
4. Do you make anything of the white area along the bolt flange on the yolk shield part? Can see it in pictures 1,2,5.
Playing with it in Photoshop I can see the possibility of a B2, B3, 62 or 63
You would have a better guess since your looking at it in person. We're restricted to one angle and can only rotate the canvas and play with the contrast and lighting
5. Would you be willing to share what brand primer/sealer color for the red oxide do you use?
PPG the DPLF 74
6. Also is there a typical color source for all the daubs I find on the car?
If your asking if there is a published list of all the paint marks your specific car should or would have had, the answer is not that I'm aware of - All the paint marks would be a challenge since each car was likely slightly different. Things like which worker was working at the time and that things were not applied exactly the same way every time (though they do tend to fall into a identifiable pattern most of the time) makes it a challenge. That is why we general focus on the "common" marks that have been documented time and time again. While leaving the odd ones for discussions until we find more examples if they are out there.
The cars buildsheet is a start and will provide you with some (less in early years and more as the car gets newer) Other than that no real source. There was a booklet published years ago but it used the MPC (the 75 version) and showed marks on only the parts being serviced at that time and their markings. Not accurate IMHO. The rest is left to us that have documented and cataloged paint marks for specific applications for 30-40 years - filling multiple binders and plenty of photos. Currently have about 7,000 pictures of just paint marks
Hesitate a bit at showing too many marks online as history has shown allot of people take the easy route and rather than asking just borrow the mark and apply it to their car with no other reason that they saw it on the internet- without any or little consideration of plant, time or how the car was equipped