If you are concerned about originality yourself and/or resale value if you plan to unload the car in the foreseeable future, then I would consider keeping all the correct parts to return it to the factory state right where they are. Then you could either sell them with the car or install them right before selling.
Because I would just keep enjoying the benefits of those secondaries opening up when I drive it.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
