I recall that there is or was at least one IC out there that could make up most of an FM broadcast receiver - my guess is that the mfr's datasheet would include a schematic. You might also search around for FM receiver kits - there are a few out there - and obtain a copy of the schematic. Amateur radio references are likely to contain some good stuff too. Keep in mind that the deviation of the transmitter and receiver must be comparable. Not all transmitters and receivers have the same deviation.