Rare 1973 340 ONLY Cylinder Heads

Bet you didn't know such a thing even existed. Casting #3671587, listed for 1973 340. These heads have unusual markings. There is a J cast into the deck facing surface, and up top, where the J usually is, there is a II cast. If you're going for an accurate restoration, these things are a must have.
They're complete with 1.88 intakes, and factory HP springs with dampers. Freshen them up, and you're good to go.
Pics to come. Asking $300 plus the ride. PM me if interested. Thanks FABO!