Other than putting a little more stress on the cam lobes, slightly stiffer springs won't hurt. Just don't get into a coil bind situation. Check the spring tension at the "valve closed" dimension and you'll get the amount of pressure holding the valve closed. The spring tester I used for a lot of years had a "click" noise that could be set to indicate when the "valve closed" dimension was reached, and I could read the tension at that point on a flex-beam torque wrench. More sophisticated ones I've used since then have a positive stop system and a scale to read spring pressure rather than using a torque wrench.
Jerry

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