.Please tell me the impedance of LO input at 10MHz and also the value of the components(C3,C4,C5,L5) required for the reactive matching at this frequency
Typically, RF components are simulated using s-parameters and signal chain characteristics (gain, IP3, NF, etc.), not their time-domain characteristics.
To do this, you would use an RF simulator such as ADS or QUCS for the s-parameters, and any number of programs to do a signal chain analysis. One that I like to use is AppCad.