Some internet "guru" will tell you that they like .055, some will say .100 from coil bind. I use what the spring makers suggest
Keep in mind, especially with aluminum heads that the head will grow taller as it warms up and the valves won't grow as much so the clearances on coil bind will be less with the motor warm up so I shoot for .060 to .080 from coil bind at room temps on all 16 springs on aluminum heads