I normally run 28 x 14.50 Hoosier Quick time pro's I just ran the 275 60 Drag radials for a weekend but they did work good for me. My car is basically all stock 45 year old leaf springs some inexspensive gas shocks. It has a best 60' of 1.49 which Im sure could get better with some better suspesion parts. I was guessing mine makes 650 to the flywheel but could be off.