What's the difference?

The air injector ports could be filled with some small allen head screws and epoxy.. and also probably filled in with Devcon or similar material. Some exhaust manifolds or headers may leave them uncovered and I'm not sure if that would cause any problems or not.
Also thanks to Cudamark for adding/clarifying to what I posted.. I forgot we were talking 360's not 340's.. it was late...