The value in an old Fender bass is its originality. They’re not prized for their weight, built quality or playability.
That’s the vintage market distilled into two sentences.
If you want a vintage Precision, keep the lovely one you have. If you want a durable, versatile and lightweight bass that will perform for the long term, I’d buy a modern Fender Pro series bass.
If you start changing bits it’s not original and the value will lower, in some cases, significantly.