The LM386 is a low power chip (0,25w@8 ohm, 1w@32 ohm) and has many flavors according to the drive load impedance and power supply. Choose carefully, according to the speakers ohms. Do not choose an LM386 driving 32 ohms if your speakers are 8! You will loose many milliwatts.

If you finally select this one, provide adequate earth on the PCB as this is what cools the chip.

I believe it is not suited for the case... Choose a stronger chip as Luciano suggested.

Ioannis