Walt, good to hear from you again, thanks
What specifically should I do to modify the shock tower?
You can see here that the spring is up against the inner tower.
Yes I was planning to add strength supports to the tube.
I have changed over to aluminum arms about 10 years ago. I changed the right side just in case it was bent. I am unable to get enough toe on both sides or more so on the left side which is a bit odd.
Yes I am aware that there is no standard number of threads showing I thought it may be a easy way to "measure" it.
If I were to elongate the spring plates the spring position won't change, I think although the car fits on the Celette bench the tube needs to move to the rear at least 1/2 inch to allow clearance and toe in I just don't know if I weld in a new tube I can get there.
Yes I saw Chuck's write up on changing the tube and many more too. Chuck suggested I machine the lower shock mount points to give more room.
Looking to get back to the track in the spring-