Gain equation of cascode common emitter amplifier with an LC tank
RE reduces and stabilises gain  of the bottom transistor.In fact gm becomes the reciprocal of RE .Example RE = 1K ohm so gm is 1 milliamp per Volt which is the reciprocal of 1 Volt per milliamp .Now the LC tank has a high impedence at resonance which is dependant on Q .100K was my calculated tank impedence at resonance on a 455KHz If strip but your job is different.So the gm is multiplied by the tank impedence to get the voltage gain .Voltage gains of more than 1000 are possible .