I think dodgestang is on the money. Most of that stuff doesn't look like they're for a shelby or even to convert a regular mustang to a shelby.
Shelby looking maybe ...
Definitely not for a 68 shelby as they're different from 67 as mentioned by 22GT.
They look like they're for a regular 67 - shorty shelby type hood, etc. The outboard mounted hi-beams grille maybe the only shelby part but probably a reproduction anyways.
So, maybe someone with a regular stang that doesn't want to do the full front shelby conversion could use the shorty hood and grille. Not sure about all the other parts as I would think you would already have them (if your car is complete). Then you need to repaint ...
I'm sure someone could use those parts especially if they're missing those pieces. Really depends on the what you're looking for but definitely NOT for someone who wants to do a shelby tribute/clone.
Couldn't guess on the value but I think they sell just the hood for several hundred dollars, right?
BTW .. dodgestang your 68/67 combo looks great!
I prefer the nose of the 67 but like the 68 hood better. I'd do it like you (but use a 67 hood with 68 style scoops) but all the 68 shelby parts already were on the car when I bought mine and didn't make sense to start over.