The Title and the 6 other registrations I found in the glove box all say it is. I even matched the Vin number to the body to make sure when I got it.

The reason Im guessing the motor was pulled was because the ground straps where disconnected and there is a tag that says some engine work was done. I just didn't know if possibly the engine is from another rig because maybe the owner blew the 65 or whatever and dropped in a slightly bigger motor from a 66.

Thats why I was trying to determine the year. Heck could this be a 1976 motor instead of a 1966?