15x7 with 4.25 backspace and 255/60-15's worked for me. I have a 8 3/4 and stock springs with a extra leaf added. Small bolt wheels by Wheel Vintiques. View attachment 1715140810
I cant quite tell from the picture, but do you have noticable rake? Do you think you have any more room to go taller in the back? Can you post a photo from straight on the side and the back?
