I'd say that a previous owner did some extensive modifications.
1) your front grill assembly was never used on a production Corvette
2) the hood is an aftermarket '73 and up 'long hood'
3) the side gills are from 70-72
4) the drivers door is '69 and up
5) rocker panels are post '69 config. (not sure what year)
6) Corvettes did not have retractable radio antennas until the late 70s
7) the luggage rack is an aftermarket addition
8) there is a strange looking 'split' in the middle of your hardtop. Is it two piece, or just a pin stripe?
Having nit picked all of this, I do like the look of the car! One of the nicer customs I've seen.
BTW, the red '68 does not have an original hood on it either.