Ok, I have now opened this huge can of worms with the 52" trick lift. So far, the problems I have run into are the leaf springs will not be properly centered without altering both the front and rear mounts. The article at that link previously mentioned,
52" Front Spring Swap is an excellent job. I am probably going to go about it a little different however. I will probably not move the rear shackle mount because I don't like the idea of cutting an extra 2" hole in the frame at that stress point. I have taken an extra set of rear shackle arms off one of my donor trucks, and will weld them to the inside of the shackle arms on the truck to make them 1.5 inches longer, and stronger. That will be the only mod on the rear mount for the front leaf springs. I then will airchisel the 6 rivets on each of the front mounts to get them out of the way, and will then fabricate an extra cross member and mounts for the front to drop the eye hole for the front of the spring about 1" and move it forward about 2". Believe me, this is not as easy of a lift as it sounds. It is not extremely difficult, but not for the novice either. I am just trying to keep from using leaf springs made in India on my MV.
I expect my truck to be down for at least a month, but it is also going to get a 205 TC swapped in where ther is now a 208, new drive shafts, and I may rebuild the TH400. I also will probably reseal the bottom end of the engine as the rear main is seeping a little.