I'm personally not a fan, but the 1JZ has some potential. Nothing like the 2JZ, but it can make 350hp if you build it right. If its an automatic, forget it. The auto trannies are terrible and can't hold the power.
If the head gasket has not been replaced, you will need to do so. The turbo supras blew head gaskets alot due to the wrong torque on the factory head bolts. I almost bought one of these cars and did a bunch of research before I did. Ended up with a different car, but the supras still seem nice.