sometimes when people rebuiild the engine they removed the engine number and stamp another one on.
 
host a pic on another website such as photobucket and copy the IMG code into your post.

 
Heres the pic of my engine bay let me know if you need more pics

just ace is spot on.   Someone has been busy with the paint brush.  See if you can find the diagnostic port .  Its gone missing from rear bulkhead near map sensor straight behind oil filler cap.   IMHO most everything else looks very genuine 1995 3SGE.   Nothing wrong with that .  Get some of the Syd guys to give it a look over. Enjoy it.

he has an aftermarket ecu, hence no diag box.
 
but yeh, it's just the STD gen3 3sge should be 180PS in standard trim.
 
engine is very clean. looks like it's most likely rebuilt. would've been good if the previous owner gave you a spec list of the engine, if he has fitted ARIAS pistons, what is the compression ratio? thinner HG? std or aftermarket cams? etc

Is the EMS stinger wired piggyback or standalone? Should have it dyno tested when you can. I always do so when buying a car with an aftermarket ecu/tune.

Thought id put one more pic up , as for the ecu i have no idea if its stand alone or not i havent had a after market ecu before .. a dyno is a must i think right now as i have no idea what it makes now after its been worked with pistons cams etc ,and ace the cams are stage 3 cams thats all the owner told me .. I asked him to give me a list the night before i bought it but he forgot to do it i was pretty pissed as i have been finding all these new after market parts which i dont mined but i have no idea about ... the car runs well tho it idles high and the mechanic said that with the cams the idle are running higher then standard . i haven't put my after market exhaust on yet coz the owner said he got pulled over so many times plus the car is loud with standard exhaust everytime i get to 5000 revs it just gets so loud and deep im thinking that maybe the cams make that sound i have no idea ....yeah i think that the owner got it painted as he was rebuilding the engine looks ok tho .. so you guys think this is a 3sge motor for sure ??

Yeah mate, that's definitely a 3S.
 
Here's a pic of another for comparison:
 

Thanks dylmrt i had a look it was alittle hard to tell since that engine has a turbo covering it but i could see a resemblance ..i just dont know why the engine number would be different ? yea maybe they stamped another engine number on the engine but i dont know why he would ...

https://www.google.com.au/search?hl=en&biw=1346&bih=636&site=imghp&tbm=isch&sa=1&q=3sge+engine+mr2&oq=3sge+engine+mr2&gs_l=img.12...36863.37830.0.39281.4.4.0.0.0.0.390.797.0j1j1j1.3.0.eiatsh..0.0.2CLyBX-D9ms