The modern stereo system
I sent my stock AM/FM to the same team who rebuilt my cluster,
Mr Heaterbox. in addition to heaterbox refurbishment and cluster rebuilds they offer a
radio service as well. They gutted the stock internals and installed new tuner, USB, aux input and Bluetooth interface. Its got RCA outs for adding on an amp. It was a little expensive but I can get all the features of a modern radio all packaged within the stock unit.
I bought a bracket from a forum member to mount 2 - 3.5" speakers in the dash, I will install 2-6x9's in the rear shelf and I bought a
slim underseat sub to fill in a bit of low end. I haven't installed all this yet since I'm still waiting on paint but it should be a hell of an improvement!