[Power Surge]

Another thing to note, it can't be a 66 Cobra engine. It's either a 66 engine, or it's a Cobra engine (or it's neither). If it's a Cobra 289, then it wouldn't be a 66. If it's a 66 engine, then it would be a GT-350 Mustang engine.

Also, without both the numbers off the motor, AND some kind of documentation linking it to a SPECIFIC car with those numbers, there's really nothing to prove it came out of a specific car.

The motor surely has value as a hi-po 289, but without documentation, I doubt you'll get "extra" value in the asking price for it being from an original car.

Lastly, if it truely IS an original small block Cobra engine, I'd much rather see you try to track down the current owner of whatever car it came from, and see if they want to purchase it.