So it appears I have mounted the leaf spring perches a little to close together. I used some pretty short leaf springs on the front of my 40 Chevy. It has a BBC. The springs were set up using some math I found on the internet as the supplier did not specify . The problem is now that the engine & trans are in place, the shackles (on the rear of the front leaf springs) are almost parallel to the frame, its going to bottom out on the first bump. The springs still have a fair curve to them and don't appear to be overloaded, I believe I spaced the mounts to close together. So I am faced with a few options: 1) Re-arch the springs, since they still have a nice curve, and are new, don't really want to do this. 2) Move the mounts back, frame is painted and it's not black, prefer not too. 3) Longer shackles, these are very short, 2" to maybe 2 1/2". Question is, do yall think I can get by with longer shackles?