Saw this posted from this thread:
http://67-72chevytrucks.com/vboard/s...d.php?t=378271
The 56" springs will bolt up with no modifications. I will tell you that the pin is not in the exact center of the spring, it's offset. But in my case that was a good thing. When i did the shackle flip on my 1970 with the stock 52" springs, my axle got pushed forward about 2 inches, and i had to use the ORD 1" add-a-leaf blocks to move the axle back so it was centered in the wheel well. Might not be as bad on longbeds, but on my shortbed it was very apparent and i would definitely plan on getting the ORD add-a-leaf kit if you go with stock length springs. I switched to 56" springs and it alleviated the problem completely. Plus, with the stock length springs the shackle angle is terrible, the shackle will be straight up and down and it will take more energy to move it, and you'll have a rougher ride. If i were you i would order the shackle flip, and tuff country ez-ride 2" springs for a 73-87 truck. Call tuff country to verify the length of their springs. Hope that helps.
I'm assuming I could pull a set of 56" springs from a 73-87 chevy and it should help with the wheel center issue and give a softer ride at the same time?