71 malibu using 15 X 8 Rallys with what appears to be 4" backspacing. Can I get a 275/60/15 under the wheelwell without any mods? Any others using this rim and backspacing whats your combo?

I have 15x10 American Racing Torque-thrusts (from the '70s), forget the backspacing, though. Mine's not a problem.

I have 255 40 18 all around.

http://i34.photobucket.com/albums/d108/charleshsj/PICT0061.jpg

I have 15 x 8's with 275/50. I recently changed out the 275/60. Same set up your looking at. Check the pics in my sig.

Pat

I have 15x10 American Racing Torque-thrusts (from the '70s), forget the backspacing, though. Mine's not a problem.
Post a photo so we can see how high your 72 is raised to clear those wheels.