consider mini-tubbing,and install a inboard spring mount in the frame,and that will be plenty of room.someone else here that has a done car should chime in to give exact measurements,but I would guess 12-14" width would be easy...just remember,big tires are very expensive,so add up costs before you cut,lol....mike...oh,i have 15x8+295-65-15's on mu 72 charger w/ no mods.