Motor ID Help

I looked at a motor my dad had stored in his garage yesterday Mom wanted me to get rid of it as my dad passed away a couple years ago and she wants the room.
So the number is 2205687 3 RL.
I looked it up and it shows that number for a 413 and 426.
How can I differentiate one from the other?
If I remember right, my dad said it was out of a CHP car.
Any help would be appreciated. Needless to say, I am not just " Getting rid of it".