Possible blown engine. Loud knock. Need advice. VIDEOS INCLUDED!

Hey guys, this is my first post in this forum.
I wont write much because my video has the information.
I'm looking for advice on what to do here. The engine sounds like it's about to blow. I trailered it back to my parent's house where it's sitting in the driveway.
I'm considering getting a hoist and pulling the engine and replacing it. I've never done an engine pull before, but first time for everything, right?
The videos I watched on youtube make it seem totally doable.
At this stage I'm looking for advice. How would you proceed given the circumstances?
I'm unemployed for probably another month, so money matters, but I have a lot of time. I can pick up a motor for less than $1k, or I can pull the motor, get a rebuild kit, and bring it down to my uncle and he and I can try and rebuild it. But for the extra couple hundred, is it worth it just to get an already running one?
Looking forward to hearing everyone's thoughts.
Sorry I didn't put it all into one video for you guys.

View: https://youtu.be/vYdUM4O-td0
Part 1


View: https://youtu.be/JJUiX35sBpU
Part 2


View: https://youtu.be/bmgR6xM6pMg
The actual knock sound
 
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