Will these tires fit?

Im going to the track and wanted to buy some slicks, the tire size is 26X10X15 made by goodyear. I was unsure if these will fit in my car though. I have a 69 Dodge Dart with Super Stock leaf Springs, standard shocks and the springs have not been moved in at all. I currently have 245/60/15's on it and could maybe fit 255/60/15's but it would be tight. The wheels i have are weld racing pro stars with a 4 1/2 inch back spacing 15X7. I also have some cop car wheels i was thinking about mounting the slicks onto if i could.
THANKS