Before I cut new springs, I'd talk with the spring manufacturer, or the tech people where you bought them. Confirm that you got the correct springs for your particular car with your particular options, and that they are designed to give you the results you want. I have seen similar concerns and the answer has been that just new springs may appear taller when they are uncompressed, but they are designed to perform like the originals when under load. Plus, with thousands of pounds pushing down on your old springs for 20, 30, 40+ years, they are going to be somewhat permanently compressed. Otherwise, why would you be replacing them?
Even if your goal is to lower the car, talk to the spring tech people. Once you cut them, there is no turning back. And there are better ways to lower a car than cutting the springs. When I replaced springs on my 70 Bonneville, they were for sure taller than the old, original ones, which were sagging. After the new springs were installed, it had the correct ride height and it rode and handled MUCH better
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