[MovieCarReplicas]

Just joined here and seen your post and wanted to give my 2 cents of building movie cars for a living. Now I don't endorse this method or approve of it entirely. Do at your own risk , but what we do sometimes for a film shoot to lower the car without spending a heap of dough was to heat the springs on our bubble caprices. Another method was to order these spring clamps from JC whitney and it would compress the spring(2 on each spring) and you can tighten down on the various coils. And the final method which was mentioned was to cut a coil.
There is a impala on my website that we heated and cut the springs. You may check the pic on there but I must upload more soon.

Good luck.

 

[MovieCarReplicas]

I agree that's why I wrote a disclaimer above first. Of course if its a daily vehicle it wouldn't be wise to do . I still have caprices in my lot for 10 years and the springs are still holding up when they were heated and the ride is not that bad.And believe me , we dogged them out to the max! I wouldn't take it cross country but it serves its purpose