I need help with rim and tire sizing

[madman 72]

Hey guys like it says above I need some help? Originally I was gonna go with a 2-4 drop with 15 inch wheels with 275-60-15, but now I am gonna go with 3.5 inch drop in front (spindle and spring)and 6 inch springs in the rear with 17 inch wheels. I am thinking a 17X8 up front and a 17X9 or 17X10 in the rear. What backspacing do I need for for these wheels? What size tires should I run? Any pics of this or like setup would be great. Any help is appreciated Thanks