Hey sorry to hear your engine went patrick Did you ever get the compression/t-kay test done 'cause you were worried about white smoke if I remember correctly!
3S-GTE is from the GT4 or you can get them from MR2 turbos as well...
Sounds like your engine is fubar btw - I would definitely go for the 'replacing' option, see if you can get your hands on a 2nd gen 3S-GE from an MR2, the price will nearly be the same as a 3S-GE from an ST162 - all you have to do is put your current intake manifold on the new engine and wire it all up.