Car sat even before. now with 3" blocks it is 2 inches lower on the driver side. I saw this in a thread 2-3 weeks ago, and thought, that has to be a fluke. Now it has happened to me. What the hell is going on?
look at the rear spring shackles, one may have " flipped " our cars have a "U" shaped rear perch, the shackle can hang BELOW it or IN it. I bet one side is IN-( lower side ) and the other side is BELOW-higher side . take a look.
That is pretty weird alright. The only thing I can think of is that when you loosened the U bolts it allowed the spring to "relax". As you know most old cars sit with the drivers side lower than the passenger side. Yours didn't but the spring may have been weaker anyway . Once a car leans it can be pretty frustrating to try to get it to sit level. I have had some success with mixing leaves from one side to the other.
Get out your "measuring stick" and find out what's different from side to side. Actually you should be able to see a 2" difference but measure from a common place on each side to the critical spots to determine what is different. If all the critical points come out the same then it has to be in the arch of the spring.
Are there new shocks front and rear? I seem to recall you replaced the fronts in another thread when you lowered it. I've worked on 3 different 53-54's in the past couple weeks and every single one had original shocks (or at least 25 year old ones) on them! I also noticed after cutting my front coils and replacing the front shocks that one side is almost 1" lower than the other. I'm hoping new rear shocks will cure it.
I know it might sound dumb, but make sure the spring is fully in the pocket at the top. I had that the first time I did the springs. I re did them again recently and now the car sags to the drivers side and pulls slightly right. just from installing brand new springs. I can't wait to do it all again. Deke