I got a 68 project that I knew going in needed considerable work, but like Salmon, discovered more and more I wanted done right. I will have had it 2 years next month. Worked on it almost daily and have been driving it for a month (still needs paint). PB Blaster with a good rapping and cold beer wait is key, and in all the work I have done on my Wisconsin car the only bolt I sheared was the same one as Salmon, bottom driver side fender.
My original 5 leaf springs seem ok, only 1/8" difference in fender height between them, ~30" off the ground and fairly stiff but I need the protection because I am running 295/50/15's (not tubbed). I am "stringing" the car today because my driver side axle slipped forward (yes it was fun, but now it crab crawls, vibrates at hwy speeds, and handles like sh!t). Having trouble finding a torque spec for the U bolts, and I think this is critical for anyone replacing springs.