Hi, harishvl003.
To calculate delay I'd do the following: set logical 1 to one input, put a square pulse signal to the second and measure delay between raising and falling fronts of input and output respectively.
To calculate leakage power - perform dc analysis and multiply leakage current on supply voltage.
To calculate dynamic power - perform transient analysis and measure total charge which flow during one switching. Multiply this quantity on supply voltage and frequency of switching.
Regards, pavel.