For one find out how long it was sitting out like in the pics with the oil fill cap off, therm housing, TB exposed for all the world to see and etc. Would be nice to hear it run but I'm sure that ain't happening. If you can get the wiring yeah ****** it up before Jimbob runs over it with the lawnmower.
any used engine is a gamble. i would go over it with a fine tooth comb. compression check..see if you pull a valve cover off and check it..better if you have one of those inspection video camera thingys so you can check the valves and insides of the engine. see if you turn it over easily.also would be better if they provided a warranty. if no warranty i would walk away. if its a private party i would walk away.
case in point. when i was looking for an LQ9 donor for my 00 Silverado. found one on craigslist from private party. everything seemed kosher till i got it home and opened up the bottom end. number 4 bearing was shot to poop and it had bad valves on passenger side head. the guy said it was pulled from a 47k mileage 06 escalade. it was more like 130k mile motor. luckily the guy worked with me and refunded me half of my money and gave me the 4L80E trans and and SS rearend. it really helps to have a buddy who is an IRS agent and threatening the guy to have my buddy "look" into his records lol...anywho morale of the story is..check..double check and triple check it over before you shell out the money.
Grand Pops always use to say" if its too good to be true..it usually is a lemon"