Denny missed that interesting art nouveau sculpture used in place of the oil pressure sending tube, as well as the fact that the wiring is near 100% back yard replacement

I'd say the horns are from the 55-59 era
you can tell the seat is non-original because it doesn't match the door panels, the factory didn't do that sort of thing ... as said, nice place to start if you want original, but I'd just drive'er and smile
Bill