22's for a 86 shortwide

i have went through the first ten pages trying to find this topic.  I'm looking to get 22 s all the way around.  what is the bolt pattern on this style of chevy but more importantly what is the backspacing i need  so that i can tuck if i decide to bag it?
 

its a 5x5 bolt pattern. mine r 22x9.5 with a +13 offset. tucks no problem

what is the widest i could go with what offset to tuck the rear?  it's a fleetside.