What engine is this?, i need help finding out what engine Options

[SSJChar]

Hey all. I'm a new member, just signed up, and im purchasing a 94 celica tomorrow. the guy says it has another engine swapped into it, and that it was a 2.0L swapped in. i checked the engine, and the block(or head, i can't remember, i have a really bad memory) said it was a 3s with some other stuff, but i can't remember what else it said. so it really is a 2.0 it seems, though i can't remember if its a 3sge, or 3sfe. whats strange is that when the new engine got swapped in, they kept the 5sfe intake. can you guys tell from the head which 3s it could be? also, whats the hp ratings on either models?

[SSJChar]

the first picture is of the identification sticker on the block, so i assume the block is 3s. the head has no identification that i could find. the plate on the firewall says st204blah blah. ill go take some more pictures of the head though to see if theres any idents that i couldnt find. im guessing its a 3s bottom end with an fe head? if thats even how the coding works that is. the ecu is a spare ecu that was in the glove compartment, so its not the ecu that the car is currently running, though maybe ill check to see what ecu its running. where is the ecu located on the st204s?