Ok After re reading the top post, I understand that you made a 96 Vmax into a 144" track and you added drop brackets to the very back. It would seem to me like that when dropping the rear, you would have to compensate for the mid mounting point as well. So here is what I would do,, I would pull the skid out,, then I would find a wooden yard stick,, drill a hole in it at one end the size of the bolt for the very front mounting point and from underneath the sled,, hold and line up the yardstick with the mounting holes,, place the bolt in the hole you drilled and into the front mounting point to hold it and keep it lined up,, it helps to have someone there,, but I did not,, so I used a nut and bolt and just loosely bolted the yardstick in the front mounting point..it will have to be somewhat loose because there is rivets that will interfere.
then I would grab a sharpie marker and line the yardstick up with the center mounting point hole and the Stock rear mounting point hole,, and from the outside of the sled,,use the sharpie to mark the holes on the yardstick.. then remove the yard stick and drill out the holes you marked in the yardstick.. then bolt the yard stick back where it was in the front mounting point. then you can line it up with the stock holes and then pivot the yardstick down and use it as a guide to mark where the new lower holes need to be drilled from underneath the sled. then use a punch to center the holes and drill the new holes. I like using a small "step bit" to drill the holes but thats just my preference.
This will pretty much assure you that you will move all the holes correctly and line them up where they need to be. Hopefully you get it figured out.