You'll have to call around. Prices are different in different locations. Here in Memphis we have a junkyard that specializes in late model Fords. They sell 4 cyl motors for $400. That's the average price at most places here.
What I'd be asking about is how many miles were on the car, can you hear it run, and what else comes with the engine. A lot of junkyards will give you late model engines with the ECU and wiring harness. This prevents any problems that could arise. Not all do it, and if you get enough of a discount without it, I wouldn't worry about it. It is nice though. Removing the wiring harness isn't something that I'd necessarily take the time to do unless the harness in the car was damaged or repaired previously.
Also, ask about warranty. Most good yards will give you a 30 day warranty, which simply gives you enough time to install the motor and get it running. I'd also have money on hand for an oil change. I generally replace the rear seal in junkyard motor installs if the mileage on the motor is high enough or if the seal on the yard motor is leaking. It's about the only thing on an SPI that wouldn't be accessible with the engine in the car. Depending on the mileage and your pocket book there are a few other considerations like the timing belt which is MUCH easier to replace with the engine out of the car. I wouldn't worry about that unless the engine you're installing has more than 80k miles and the belt appears to be original or damaged.
Also, check everything that you can check in your own engine compartment when you remove your old engine- like vacuum hoses- to be sure that you're not going to install a good motor in a car that won't run right because of parts outside the motor.
To get it running, don't worry about replacing spark plugs- just remove the ones from your engine and the yard engine, clean with a knife or wire brush, and install the best looking 4. Check gap of course. You'll also want to keep all the expensive parts you can keep from your motor- like the fuel injectors.
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