I reviewed your data plate manually. There is good news and not so good news.
1) Your car is indeed an original 400 Sport model. The "3JF" means you have 2 separate options in Group 3, "J" which we are not sure what it means and "F" which was the 400 model.
2) The not so good news (depending on your desires) is that your car left the factory with a TH 400 transmission under it and only 2 pedals on the floor. Someplace in its life it got converted to a stick car. I only saw the one RH factory traction bar under the car in the photos - if the left side one is missing and there is no Riv Nut on the rear frame rail and reinforcement plate on that side under the rear seat, that would pretty much confirm that.
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
