Need help with my civic
 

So i recently got a 91 civic ex. The engine that is in my car is a 93-95 vetec-e engine that was swapped in awhile ago. So the guy I got it from drove it to our friends one night and the next morning it wouldnt start. That being said, I replaced the battery since the old one was dead, replaced the spark plugs since they were shot. The starter will crank, and the engine kicks like its trying to start, but i wont fire. Im not sure where exactly the problem is, but im hoping someone may have some suggestions. thanks for reading.