Help choosing a v8 for my dart

65 dart gt with a slant 6 auto on floor. Looking to swap in a v8. I found these two locally. First one says it’s a 318 out of a 70 charger with a 4 speed automatic trans. Engine and trans ran and shifted well when pulled. Comes with carburetor. What 4 speed trans does it look like and what would the fit be like in my 65?

Second engine is a 1999 5.2 magnum. 108k miles. Regular oil changes. Owner swapped in a 360 magnum in its place. Ran well when pulled.

how do these look to you and which would you go for, if any? The 1970 is 700 bucks total and the magnum is 400

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Put one like this in it.