Based on your Avatar, I would assume that you are referring to a '35-36 Ford Philco radio..
There are several vendors that make claims about being able to convert old radios to modern AM/FM, etc., receivers. The expense can be great, plus the added components take up a lot of space..
A neat little trick to gain some "tunes" etc., in a '35-37 Ford is to find a AM/FM radio that has conventional knobs for station selection, etc., in lieu of digital controls.
Removing the knobs from the modern radio, with a little bit of work, the shafts from the original radio head can be adapted to fit where the radio knobs were.. The original radio head therein becomes a remote operational unit...Sometimes the connection can be a simple as using a section of plastic tubing to attach the cables to the radio shafts.
Many years ago I had two friends that rigged their radios in the preceding fashion..