When I got my 64 the passenger side spring was installed upside down and the spring would be plucked like a guitar string by the inside edge of the bump stop when the suspension cycled enough to move the spring.. I didn’t know what was wrong with it till I pulled it apart and compared it to the driver side which did not behave this was. This is when I cut my springs down. I wasn’t sure how they were supposed to go together so a bit of trial an error made it clear to me that the tangential end needed to go up and the flatter end sat on the perch.. Otherwise I’d be back to playing the guitar..
After I put it all back together, I had no more problems with regards to the springs.
This was done in June of 2017 with no problems to this date..
I worked on getting the toe in adjusted centering the steering wheel and drove it around for a weekend but I just couldn’t get it to stay aligned. The strut rod bushings were toast and I figured control arm bushings were probably not great either and the ball joints should be replaced.. So I went with a mini subframe kit which prettty much replaces all that and improves the front ends ability to stay aligned..