Ah! That would kinda explain it. The one in USAF Museum is MiG-23MS, which indeed has a radar scope. Point is, that it was early downgraded export version for 3rd World countries (Libya, Syria, Egypt, Algeria) that used radar and weapons system from MiG-21S/SM (RP-22SM radar and R-3/R-13 missiles - copies of AIM-9), instead of "proper" Sapfir-23 radar and R-23 missiles.
(also the earliest MiG-23S, which were the first production variant of 23, had RP-22 and normal scope, but they were fitted with them due to delays with development of Sapfir-23 radar)
Cockpit of "full-capability" MiG-23's looked like this:
https://en.wikipedia.org/wiki/Mikoyan-G ... lution.jpg
MiG-23K was planned 1970s carrier-borne variant with more bubble-like canopy and if built, it would probably used the "advanced" weapon system with Sapfir-23 (or something more custom-tailored), instead of outdated RP-22.
As for F-14 and F-16 - they look nice (although side panels are lacking, fuselage sides on F-14 look low and there's canopy frame missing
), but of course lack of colors complicate perception a little bit.