s-10 wheel back spacing

i got a 86 s-10 bagged with drop spindles. I want to run 18x8.5. what back spacing should i get so i can still tuck?

when i had my 18s mine were 18x7 with a 4.25bs..worked great.. not sure exact spacing for 18x8s but should be around 5.5bs.  go on s-10forum.com they have a wheel/tire/backspacing chart that is pretty good if you arent bodydropped..

thanks.i'll try that

my 20 x 8.5 up front are 5.4" bs. my 18 x 8.5 i used to have were close to that. my 22 x 9 out back are 5.5" bs.