First welcome to the site. Hope you find the support and information your looking for related to concours focused restorations of your Mustang
Secondy thank you for your nice comments
1. What color for the front crossmember tube, and at what point was it installed - any overspray or anything?
Bob covered this point very well. For me its almost a gloss black but surely on the glossy side of semi-gloss black. Since it was added well after all of the painting and likely in the second half of the build it was not on the car when any of the painting was going on and considering where its attached it would be unusual for the wheel well sound deadener to be sprayed that far down on the frame rail above it to get any spray on the cross member
2. Rear fenderwell overspray - When viewed from the side, were San Jose rear areas liberally sprayed body color covering the frame rails and entire inner area? Or just lightly over sprayed letting some oxide show from the side view? Same for color hitting the front spring pocket?
Considering that were discussing 67 San Jose built cars the sound deadener in the rear wheel wells was typically applied after the exterior red oxide coat or the light gray primer filler coat applied to the quarter panel so if the exterior color was not applied in an area like behind the wheel lip the red oxide would not be seen there. As in the article visualize painters using spray gun fully flowing as it passed over the wheel well opening and covering the inner lip of the quarter panel the same or similar amount of paint that was going on the quarter panel was being applied to the back surface visible from the side of the car. Up at the top, back and front surfaces less paint fading away as it reached the shadow produced by the wheel lip itself
In the front wheel well the inner fender panels and the shock tower were typically well covered with black paint so any red oxide in the shock tower area originally was not present or would be minimal in maybe the top most surface (later covered by the spring cover. On the leading and rear surface of the shock tower depression the black paint was a bit thinner so it would often wear away or rust through on 50 year old cars and IMHO this lead some early restorers to assume what they were finding or thought they found was not the look of an original car but the results of years of exposure and wear.
3. I saw traces what I believe was seam sealer on the very lower part of the firewall where it meets the inner fender apron on the inside (engine side). This extended up from the frame to the a/c motor height, would that be correct or was this a fix during one of its repairs/repaints?
You didn't happen to include when your car was built, one of the key pieces of information needed for most of our discussions and responses. Helps narrow down the search and can help look for the worker or workers and their habits around that time period.
If you can provide that I can look through examples and report back.
As you can see on many of the long term members here this when it was built as well as other information has been addressed by adding your cars VIN, or information with other details as your signature so you won't have to include it every time you post a question
Again welcome
