I have a problem about giving values to resistors to have high differential gain. Also I am not sure I set up the circuit correctly on Ltspice.

 

Your PNPs are in the circuit backwards and there are missing connections on the lines labeled as outputs.

 

Your PNPs are in the circuit backwards and there are missing connections on the lines labeled as outputs.

Thank you! I changed the output part but the only pnp model that I find is this one. The desired pnp model is 2N2907, I can't fix this. I'm not familiar with Spice

 

You simply need to flip the symbol top-to-bottom. I don't know how you do this in LTspice since I don't use it, but there are probably mirror and rotate operations e.g. rotate 90 degrees twice then mirror

edit: there may be a mirror vertically operation which does what is required in one step

 

You simply need to flip the symbol top-to-bottom. I don't know how you do this in LTspice since I don't use it, but there are probably mirror and rotate operations e.g. rotate 90 degrees twice then mirror

edit: there may be a mirror vertically operation which does what is required in one step

Yes, thank you now it is all done I think

 

You should/must (?) name the two outputs differently. If they have the same name the simulator may consider them to be connected.

.tran 4mS (assuming that is correct syntax, which again I don't know) should be
.tran 4ms - lower case s for seconds, upper case for Siemens (unit of transconductance)

 

You should/must (?) name the two outputs differently. If they have the same name the simulator may consider them to be connected.

.tran 4mS (assuming that is correct syntax, which again I don't know) should be
.tran 4ms - lower case s for seconds, upper case for Siemens (unit of transconductance)

The given circuit names them as the same Vout. But I'm changing it in LTspice now. Thank you again.

 

Change those Vin to something different as well.

 

The given circuit names them as the same Vout.

The original circuit names the differential output from the two outputs as Vout.
Spice connects all nodes with the same name together, so you need to label the two inputs and two outputs with different names.
I've sometimes been puzzled by strange simulated circuit behavior when I've inadvertently given two different nodes the same name and Spice dutifully connects them together.