Simulation isn't working for high voltage amplifier
I found some errors in the original schematic, they are corrected.

For newer FETs, the quiescent current had to be set. I set this to 5mA with R19 and R25. (14k instead of 10k.) There is no point in looking in front of the LF356, there is only a -2 gain there (OP07).

The DC gain is approx. 174x.
DC transfer characteristics:

At 100Hz, the gain is approx. half the DC gain.