I have to admit, I like the look of the 89-91 single rectangular headlights. Rene's is that way and it does look nicer.
I had the 80, it was OK, didn't hate it or love it.
Now I have a 91 with the quad, and I have an 89 with the single.
Keeping the 91, the 89 is being parted for now.
I also have an 88 front with the stacked quads, and had a burb with the same setup.
I can say that I always keep what I have, no swappng necessary.
I also have a 77 with the round headlight, and if I could have the sloping hood with better visibility and retain that front look I would do it.
The hood on the 84 with single headlight was the only thing that kept me from tossing the truck.
I just realized appart from the 84 that I traded for a commuter car, I have every phase since the 70's I even have a 70.

70, 77, 80, 85, 88, 89, 91.
I guess I shouldn't sell any now, I have the perfect number 7