ford 9 inch rear

Just swapped a ford 8 inch for a ford 9 inch rearend. I also installed 17x7 rims with 225/50 firestone firehawks tires. The rear fender edge keeps cutting into the tires when i hit a bump or dip in the road. The stock bump stops in the frame are about 8 to 10 inches away from rear end. How do i...

I have a Ford 9" rear that measures 59 3/8" flange to flange. I think it came out of a 68 Mustang. I believe the spring perches are correct but the width at the flanges is a little wider than the 65 had. Has anyone tried this set up or know someone that has? I'm woried that I may have a problem...