69 chevelle big wheel question

[zx10intn]

ok, i know many of you do and many of you dont agree with putting large wheels on these classics, but i like the look and have decided to go for it. i have read for hours, and just need a little help with a couple of questions to make sure what im hoping to order will fit. im planning on running these wheels, http://www.marshalltirecenter.com/pr...uctId=10888100 , in a 22. the front wheels will be 22x9 with a 5.747 backspace with a 245/30/22 tire. the rears will be a 22x10.5 with a 6.497 backspace and 295/25/22 tire. there are a few backspacing options available with each, but what has me confused as to which one to go with is I have the 12 bolt rear end on mine, which i understand is shorter im not sure which option is best for me. anyone with advice on this decision is greatly appreciated.