Radio suggestions ?

I bought a used original am/fm for my Swinger. Fm is much better that just Am even if it's not stereo and just through the dash speaker.
What I want to do (but lack the skill and knowledge) is to install the bluetooth technology into the original am radio. That way all the wiring is in the dash and i could just run speaker wires to the hidden speakers. Then the original radio would control the volume and my phone would be the transmitter. I know it can be done I have seen ppl do it i just cant seem to figure out how its done. Electronics are not my strong suit! And its not cheap to have someone do it right for you. So a 20 buck bluetooth stereo will have to work. Although I have alot to get done before that is even a concern lol.