For what it's worth, I have a '73, black block neck Jazz, and it is also stamped J. Torres. I bought mine in 2002 for about $1350 from Gruhn Guitars in Nashville. It had the original pickups, one of which still needs to be rewound, as well as the bridge, tuners, pots, etc. I ended up having it refretted professionally (it really needed it) and dropped a Badass II on it as well as a J-Retro Preamp and Seymour Duncan pickups. It also has replacement tuners (one of them was loose - I replaced them with direct fit Schallers). I still have all the original parts should I want to return it to stock.
As it is modified, my guess is you could probably get about a grand or so for it due to the mods, but I could be wrong. If you part it out you might get a bit more. Best of luck with the trade and/or sale.
Alan