I agree that the 72-74 side marker lights are not the most attractive.
What you could do is fit in some other type of light so you still have markers, but they aren't as homely looking. The popular choice would be 70-71 versions, but this would require you source the trim bezel, housing, and lenses in a very rapid time, which may not be that easy to do. Another option would be to fill the stock locations and move them lower on the fenders or substitute a different marker style. The '68 mopar markers are small 2" round lights that are very nice and fairly unobtrusive. Another option is the walk your local salvage yard and just grab a set off a car that you like the look of. An easy, albeit unpopular option, would be to get camaro or mustang parts and adapt them. Since parts for those two cars are very prolific in their market saturation and are easily available everywhere, it would be no problem getting them or replacement parts in future years.