Help me choose best lowering options

[bakerboys]

I have a 77 swb i put 7 inch wide wheels on front and 10 inch wide on back
tire in back is 275/60/15

with new wheels and tires on the back from ground to fender measures 33 inches If I do a 5 inch flip kit will it be so low that my tires may srub in the back or should I do a 4 inch hangers also I have 8 leafs in my leaf pack

it is a custom deluxe C10 I found that Godfathers has a good price
here is a link
http://www.gcustoms.com/7387-chevygm...258b370b8c9977

any and all help for this newbie would be great