Some questions before I make the purchase

[Blazerowner]

So I am looking at two different engines to put in my c10. First is a LQ9 with 80k miles out of an 05 2500 Silverado. Mileage is not verifiable. He has the uncut harness, Drive by wire pedal and 4l60e tranny. He says he wants $2200 with the transmission or $1500 without the transmission. What is the opinion on the price and what should I look for as far as parts that need to come with it? Also would it be better to just buy the engine and get a 4l80e. I know the 4l60e is not the greatest from other opinions on here. Seems better to save the 700 and get the heavier duty trans.

Second engine is an LQ9 out of an 06 escalade that has 89k miles. No tranny and is $2300 plus shipping. Now this motor has verifiable miles which is a plus. Anyone can say low miles but without proof who knows. Still another 800 bucks and still have to ship it. Is it worth it?

Im leaning toward the first choice because of price, but wanted to see what you all think considering I have never done this.