If that is infact the model # of your CB, then yes it has a jack for the PA and for an external speaker.
Page 7 shows it.
2. PUBLIC ADDRESS: An external 8-ohm 4.0 watt PAspeaker may be
connected to the PASpeaker Jack when this unit is used as a public
address system. The speaker should be directed away from the
microphone to prevent acoustic feed-back. Physical separation or
isolation of the microphone and speaker must be employed when
operating the PAat high output levels.
3. EXTERNAL SPEAKER: The External Speaker Jack is used for
remote receiver monitoring. The external speaker should have
8-ohm impedance and be rated to handle at least 4.0 watts. When
the external speaker is plugged in, the internal speaker is
Here's a place you may consider mounting the speaker.
External Speaker Install