The driveshaft is soaking and looks much better already, but I need to find some more Evaporust to finish it. There is one stripe clearly showing. Any guesses as to what the stripe color will be. It?s a Late 68, 289 Automatic. 8? rear.
No guessing needed

We can help at least with the identification stripes and yoke colors.
Resources on site include (in the search feature just used "68 driveline stripes"
- Late 68 San Jose C Code Coupe - Unrestored Picture Thread in the Unrestored picture section of the site. Picture U-27 on second page nice shot of the three colors and their general location. Barely shows the orange trans yoke at U-6. Remember painted before machining
-
https://www.concoursmustang.com/forum/index.php?topic=11581.0 couple of discussions merged
- Buildsheets describe the colors as DGRNLAVWHT - Dark Green- Lavender- White

I dropped the yoke in fresh Evaporust and it came out perfect! You can clearly see the original orange paint.
The paint is a dull flat orange. The pics I have seen on here is a bright orange. Has the original paint faded, did the Evaporust change the color, or do I need to match the color I found? (In the pic it looks much brighter than in person)
Yes the original color has likely been altered by time and exposure. Here is an example of a cleaned original we have posted by a member in another thread.

It may be currently flatter (not glossy) due to the chemicals, exposure, age and so on compared to the original finish and yes of course colors look different after being taken with a camera and then posted and viewed on a monitor