61
New from the Jack Bruce channel, from the ArtWorks Scotland documentary.
I wouldn't. Most 4000's were routed for a neck pickup, and those are absolutely fine to convert, preferably keeping the original pickguard and harness intact and using a reisuue guard. But please don't take a dremel to a mint 1967 bass.
Is it unethical to want to track down a vintage toaster and make it a 4001S?