advice

[vex]

Really depends on a lot of factors here. When you swapped everything over did you keep the S5 injectors or did you go to the S4? They changed impedance if I remember correctly. If you kept the S5 (which it sounds like you did) you need to ensure you're not passing the injector harness through the resistor blocks. If that's not the case, and you've confirmed good compression on the engine, you may have just flooded it to hell. Pull the spark plug, pull the inj fuse from the engine bay fuse box, crank over with the gas pedal depressed for a few seconds. Ensure all excess fuel is out of the engine, maybe even leave it over night with the plugs out. Reinstall plugs, fuse, and crank over. If it kicks but doesn't stay idling there may be another issue.