How to ID a 4cyl aq 270 outdrive versus a larger aq 270 outdrive

[Skidude17]

I have a volvo penta 270 outdrive powered by a buick v6. I found a complete outdrive with the transom shield and tilt motor on craigslist for $175, but I need to make sure it is not the 4 cylinder version. Are there any easy ways to identify which version the 270 outdrive is?
Thanks in advance for your help.