I have been researching drag radial tires for my 69 nova. I think I'm going to get the Mickey Thompson ET streets. I have a ford 9" rear if that matters any. I think it's the same length as the 10 bolt I pulled out. I'm running 15x8 weld draglite wheels with 5.5 backspace. What size tire is better 275-50-15 or 275-60-15. I realize the middle number on tires is the aspect ratio,(tire height) With the 60's being a little taller tire vs the 50's.