I really like the sportsman st tire. I took a gamble when putting tires on my 68 coronet, liked them so much I put them on my 70 swinger!Just an FYI, The Mickey Thompson Sportsman ST tire is also made by the same company as Coopers. The Mickey Thompson is also period correct as they were the first DOT street approved " Indy" low profile tires. Firestone and Goodyear also made low profile tires but they were road race tires that guys used on the streets, available in the late sixties and were not street legal. Paper thin sidewalls with painted on lettering.
https://www.mickeythompsontires.com/street-tires/