This may sound like a dumb question, but Ive never worked with one before. How do I know which is the inlet hole and the outlet? Here are a couple pics I found to use: (also engine looks like **** because I took my intake off to get ported as well as took some other things off to clean up and rearrange)

 

Images aren't opening for me. But like a vacuum cleaner, when running, the inlet would be the one with suction.