b series engines are not that much heavier than d series ones.
If it were me, Id just grab some off-the-shelf h&r sports and call it done....oh wait, thats what I did
Don't forget you'll need new shocks to compensate.
Ground Control offers custom rate coilovers, along w/ a general rate set as well. I advice those if you think you'll be raising it and lowering it with the changes in weather (snow/summer).