Raising Rear End with a Lift Block kit on my Slant six

You will probably need to get new springs, have your old ones re-arched, or get a leaf or two from an old truck and some new leaf spring bolts and put them in with your springs. I had stock /6 springs and did the last of the three options because I am on a tight budget. It stiffened up my rear and raised it an inch or two, and I only put in one per side.