Got the Cooper Cobras on my 85 442 and they are a really good tire (they were also the only option for a RWL tire). I didn’t realize they made repro Eagle GTs. I’ll have to look into those.
I'm not saying to buy them here. I'm just giving you a starting point: https://www.tiresandwires.com/Goodyear-Eagle-GT-P21565R15-Muscle-Car-Tires