Wheel backspacing

[ED70K5]

Finally got my 6 in. Skyjacker system and now it's time for a new set of wheels for my new set of tires. What backspacing should I use to avoid rubbing??

details: 1970 K5.......36 x 12.50 15 TSL SX.......15x10

 

['73 K5]

3.5 to 3.75 inches should be fine. I would completely avoid 4 inchers. One of the reasons I went with the Eagle 589's is because they have 3 5/8 inch backspacing. Anything less than 3.5 will put more stress on wheel bearings, etc.

'73 K5
Chevy good...Ford bad