I agree completely about the history part, the C-141 is being retired after nearly 40 years of faithful and honorable service, and no one even notices. But that’s another thread unto itself.
After one of the treaties, the number of operational MSB’s was severely limited, so the AF got rid of all additional BUFFs, by virtue of removing the tail and painting an X on the upper wings for the satellites, or relegation to the AMARC. It's my understanding that the only ones that remain are the operational acft.
1) I agree
2) I'm not disputing you, I just can't find any reference in my old MX books or the P&W website about a JT-3C, just the JT-3 model.
3) You are right about the ANG/AFRES 135's, there are 161 of the TF-33 '135s, and I believe they are all in the ANG/AFRES. However, I believe most of the RC/EC 135's and all of the 707 variants (E-3, E-6, E-8, VC-137 etc.) use the TF-33. The E-6 Tacomo is the only one that I know of that uses the CFM-56.
4) I have no idea.
on the Tech ops forum, he may know about the –C model.