Jess,
If the '54 radio is a a truck radio (with speaker bracket and mounting bracket), it has a lot of value ($150-200 not working; $300+ working).
If it is a car radio, its value is much less: $20-100 for manual tuning; $30-?? for push-button tuning (depending on if it is working and all the parts are there).
Someone else will have to answer about filling/covering the holes, but my guess is that welding is called for.
Tim
