Help Before Buying!

i'm looking at buying a 94 nissan sentra se with almost 133,000 miles on it, it has some minor front end damage i can fix so it's only $699. good deal i think, but i was under the influence that the se was the top of the line and this "se" has manuel crank windows. it runs nice but the guy selling it doesn't know much about the technical side of the car. the engine says "twin cam" so does that mean i have a 1.6 or a 2.0 engine. please help me! they are sending it away to auction on tuesday so i need some info fast, thank you.