94 still uses an OBD I computer, which has limited computing power. The computer will likely not be able to compensate for the cam without burning a new PROM. Similarly, the fuel and ignition maps in these PROMs are take advantage of the fact that the EGR lowers combustion temps, so they tend to run a more aggressive advance curve in the midrange. The EGR control from the computer is actually the least of your problems, since the computer simply sends a 12V signal to a solenoid. If the solenoid is not hooked up, nothing happens so long as the connector is taped up and can't short out.
Bottom line is that you need a custom PROM.