I picked up a 1970 Panther with a bad 399 Kohler a few weeks ago. A friend just gave me a 1971 440 Panther and a 1973 340 Panther. I got the 340 running and have not started working on the 440 yet. I would like to use one of the motors in the 1970. Anyone know if either of thoes motors are easier to swap into the '70. I have not looked at the mounts yet.