You could block it up and run some rocker covers with PCV breather atachments. But for my buck I would keep the sealed covers, they look way cool, and route that breather back into you closed system. As a note, and i see nobody has mentioned this. If you keep the original PCV exit. The one at the back, you MUST provide a source for air to enter the system. In a stock manifold this is by the oil CAP. Don't change your manifold to the one that does not have the filler in the front of it or you will draw a vacuum on the crankcase. I would suggest you look up PCV on this site and get a good idea of the reason why its all there before you start removing too much.
just my 2c
Andy.