Henry I had(like a lot of us probably had) the same problem but my crosember was only 3" from the ground. Didn't take to long driving it before I bottom out to many times on the great roads of NYS. I raised mine to 5" and did what you are doing except I don't have coil-overs. I used a different shock and spring in front and added a extra leaf in the rear and it's worked fine for me. Nice looking car by the way.