69 stepside lowering question

[69vetteside]

Hi guys,What i have kinda sussed out so far thanks to you guys is my truck seems to be lowered 3/4 approx.done only with lowered springs(coil).
the spindles are stockies.shocks ,cant tell they have no markings and are painted yellow as springs
My ride is very soft and bouncy.it leans on the drivers side.
will a stiffer shock help and how stiff ,whats a good one?
i will get a front sway bar as it has plenty of body roll.
I intend to swap the 20" rims and rubber band tyres for a set of 17"x8"&11" wheels i have and run 27" front and 31 " rear tyres.
the rear will then be lowered more to even out the stance. the fronts at the moment with the 20" rim and tyre measures 27"so the front wont change.