Jegs sells the BFG TA's in the size I wanted, for 15" rims. No other tire store had them in stock, and they all wanted more money. The factory tires wore out fast, due to extensive road testing.

When day two really was more like year two of ownership, and it was time to replace the wheels and tires, the TA's were a popular choice. So were Uniroyal Tiger Paws, which were also used by Pontiac on the GTO. Less expensive, but hard to find today, so I went with the TA's.
If you really want to look like back in the day, just buy the cheepest RWL off brand tires you can find. Check out the old photos of barn-finds, and that's what you're likely to find.
If you were going to street race, you had a set of slicks for that. If you wanted to show off by buring rubber, better to buy the cheep tires.

JMO