300 I6 in a 65 ?

Anyone ever looked into using a 300 ci I6 if a previous I6 (170 ci) car ? I wonder about the overall lenth of the 300. A guy on craigslist has a complete nonrunning engine for $50 before it goes to scrap yard. Seems like an interesting swap if it's doable.
 
Have you read the Wiki about the 3rd and 4th generations of the I6?

The 300 was a truck motor and should have a Windsor bell housing. I think the mounts For a car are going to be an issue, and length is going to make it a tight squeeze. But more power can be made with the not cast in manifolds.
This site probably has your answers.