If you use the small (factory size) 7* keepers most pockets will have your installed height around 1.75". You can increase that to about 1.80 with +.050 locks (designed for this purpose). The larger heavy duty 11* keepers make roughly the same installed height as the small +.050 locks, so typically you are looking at about 1.80" tall. The 11* locks are also available in a +.050 variety which puts you up to about 1.85".
All pockets are a little different so the example I gave above is kind of generic. There are two ways to increase installed height if you can't get what you need by changing locks/retainers and adding shims. 1) cut the pockets deeper like PDQ said. 2) get valves with longer stems.
Whatever you do don't just install the springs too short --- that will increase the seat and open pressure to a level that can potentially damage the cam (wiped lobe)
E85 racer and E85 carb builder
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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle