Welcome! Love the color of this. Any idea if it's factory color? I had an 81 that looked similar.
If it were mine, I'd see if I could find an original 3- piece rear spoiler. Just something about the charm of the old 4-eye foxes.
As for your wheel situation, that's a hard one. I've been through it all with these older cars and recently decided that 5-lug swapping was the best option. Here's my reasoning: The older foxes 79-86? Can't remember when they changed but the braking system was terrible. The 87-93 v8 cars got slightly larger brakes. Still not "good" braking by any stretch, but not quite as bad. At the very least, I figured it's worth swapping over to the 87-93 v8 spindles and brakes. If you're swapping that stuff, it's not really much harder to step up to 5-lug. That not only gives you brakes that are WAY better, but you have much better wheel options.
If you plan on staying 4-lug, no big deal. It's definitely a lot cheaper. You can find guys selling 4-lug wheels with nearly new tires for next to nothing.
So, it looks like you have pony wheels currently? You're just looking for something nicer or what?