I got a set from the GSCA for my 67 a long time ago. I remember them telling me it crossed to a 68 GS 350, but I am not 100% sure. The springs were moog and they did have a nice ride height.
I later had a set made by Eaton Spring that transferred weight better for drag racing. They had a smaller wire but more coils. They used the stock coil to figure out the racing coil and had dimensions for both. I would try them and see what they still have or can make. They were not that expensive then, I don't know about now.........
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