im new to the site, have a question hope someone can shine some light. I have a resto project 1968 shortbed c10 454 700r4 with a 10 bolt rear disc 3:73 gears. i would like to put 20" wheels under it with at least a 10" wide footprint in the rear. Has anyone done this and what would be the correct backspacing to get a good look and tire size with the 4" drop i have installed on it? tubbing out the wheel wells is definitely an option.