Bull shit. They're fucking you! An $18,000 or $25,000 is a racing motor, and you would have to make all kinds of engine mount and transmission mods just to fit it.
What kind of motor do you have now?
Even if you have the GT. you're looking at a 2.8 V6. If not then it's a 2.0 They're trying to bend you over for sure. Go somewhere else. You can get that engine fully rebuilt, for like $2000 and a used one from the junk yard (Though I don