Price depends by locations and who is doing the work. If you live in a city that has a lot of japanese mechanic shops then it's probably cheaper. Price over in Socal is roughly around $800-$1200 in labor. Try to make some friends in your car club so they can hook you up with mechanic friends.
When replacing engines there are a few options you need to think it over.
are you buying a used JDM Engine? I don't recommend this option unless you are looking for a temporary fix and want to gamble with not knowing exactly what you'll get. Ask them to show you a compression test.
are you get a used engine locally from a wreck? If you choose this option then you might want to repalce seals, gasket, etc.
are you buying a brand new motor from Nissan? My guess is that it'll cost anywhere from $2000-$3000 just the motor alone but this is the safest route and will ensure your car run another 100K miles if your mechanic do the job right.
1989 Supra Turbo
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