The dreaded backspace question.. But different

[jcblue]

I have read through all the searches I could and found a lot of useful info.. What j didn't didn't find were pics from the back end to show the wheels position in relation to the fender or bedside, and I would also like to see some from underneath to see how close the wheel is to the wheel tub .. I have a 72 dropped 5/7 and from reading on here that with the wide rear I need a 5.5 backspace on a 20x10 and a 5.25 on a 20x8.5. I want to run 255/40 and 295/40 tires.. Will I be able to get .25 less backspace with that wide of tire in the rear? I read that a 5.25 backspace would work buy the truck owner ran a 275/35 tire.. Would really like to see some pics of the above stated..