Pete,
My local Goodyear dealer pushed Blue Streaks in '65-66 and also carried the "Speedway 350" in '67 , but for '68 the big push was for Polyglas tires. Then in '69 the 60 series tires were the "have to have" tire , even over "not street legal" race tires they also sold. The less expensive "Rally GT" was the next addition.
Randy