Originally Posted by Alaskan_TA
If it is a race car, why add extra weight like marker lights & lower dash pads?
Guessing he wants to run a class that the combination is limited to 1968 bodies. Perhaps he wants to run NHRA GT classes. With a 68 you can run a Hemi scoop. 67 no fresh air.

If he wants to run a 340 in Stock or Super Stock (excepting the GT classes) he would need to run a 68.

So there can be lots of reasons to change the year.

Of course this is assuming it is a race car.