engine replacement or head gasket

[flathead6]

I have a chance to purchase my friends 08 wounded yaris(120000 miles). he was driving when temp light came on.. he kept driving 5 more miles and the car overheated and shut down. Towed home. Car will not start. I plan to do a compression test but assume the head gasket is blown and maybe worse. I'm a diy guy and have rebuilt engines before and can do my own machine work.

Is it worth digging into it or should I just opt for a good used engine??

It's a manual trans do I need to replace the engine from another manual trans car?

Are there any unusual things I should concern myself with completing the replacement engine swap?


What is the best manual to get for reference?

Thanks