You're saying it won't turn over at all now? If that is the case check the battery power and connections at the battery and ground connections.
Sometimes bad Ground and/or bad Battery Connections are the demon...
Put the correct size socket on the crank pulley bolt and spin the engine over with a big ratchet or cheater bar to see that nothing has locked up or started to stick in the rotating assembly of the engine. I know its metric, but 7/8 fits well.
Once the car is turning over and or starting again:
Check that you are getting spark at all 4 ends of the spark plug wires, and that they are in the right order as el_freddo says.
If that all checks out; maybe you still have a problem with dirty fuel? How old is the gas in the tank?
Sometimes a dose of Stabil, Lucas Fuel Injector Cleaner, Heat, and/or all of the above work.
Also, on 3rd gens (EA82s) there are TWO fuel filters... you only mention replacing one.