130# springs is what I would start with. You'll have to compress them them to get the shock to the right installed length. That will store some energy and help get the tire applied. Without a decent double adjustable shock, you may as well have put ladder bars on it. Proper installed length of the shock has to be maintained after moving ride heights and shock mounts. Lowering the car some would help the 4 link geometry. Ideally, with the rear at ride height, the bottom hole in the chassis bracket should be the same height from the ground or slightly lower than the bottom hole of the axle bracket.