First of all, flipping to black walls is a waste of time and $$$$. While it's not a NASCAR-stocker, it's also not a policecar/taxi, the only way 6" of black sidewall look good. Modern cars can get away with blackwalls because they're running 40 and 50 series tires.
You have alternatives. I have no idea how old those tires are (haven't seen Hoosiers sold in a while) but if they aren't that old, they can be turned into whitewalls. I've done it a few times to get a whitewall 60 series tire, but it's more of an advanced-level and time consuming project. The end result can be awesome, but it's labor intensive and hard to do.
Your best bet is to just sell that rim/tire combo to someone who wants it. More of those smoothie-Chinese chrome rims are a universal bolt pattern, so they'll probably fit any 50s-90s RWD car/truck. I'd say they're worth $250 as is on CL.
Then I'd find:
1) a set of 15x7 or 8" steel rims. Imperials (of that year) use a GM pattern. Go for the extra width since you'll put a stock cap on anyway and only your hairdresser will know for sure. Get your basic set of WW radials. I have a set of Made-in-Ohio Mastercraft 235/75/15's mounted in 7" police rims w/full wheelcovers. I've been running them since last winter, about 8000 miles and have zero complaints. In fact, they handle surprisingly well. They cost me $320 OTD at my local mom & pop tire store. I found that quote hard to believe and have been thinking about buying extra sets ever since. (Pic attached)
2) Find some 17" rims you can live with (I went for a somewhat period correct rim, vs. Ugly modern food-processor blade rims) and enjoy a huge selection of blackwalls with that will at least not look as bad as a 75 series blackwall. Or...
2b) go the extra mile and buy 17" whitewalls which I hear-tell are still available for funeral coaches and limos under a "professional car" line from Goodyear at $200+ each. You would a hero to many if you went that route.
I'm attaching a perfect stock vs. 17" shot for you. It required me to travel back in time about 15 years, but I knew you'd need this photo. While I was there I also wrote a letter to Donald Trump and asked him to take Oprah's advice and run for President someday.
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