we put some 51" toy rears up front with the front bolt 1" forward and 2" down and a 7" shackle on my friends 85 I I think it sits lower than stock and flexs like crazy.  If you ran 5 leaf 48"rears up front with the stock hanger and a 5" shackle you would get no more than 3" of lift and a buttload of flex with a nice ride.  I would just put a longer shackle and the shocks like/\ in the back and you'd be good