Wow Rick, that is a huge vent.
I have the standard Ford vent that screws into the top. It is like 3/8 " Pipe thread, maybe 1/4".
After you put the fitting in, you run a two or three foot hose up, into the frame and put one of those "breather" ends on. I got the greather from GM.
Without it, worst is you will pop a seal due to pressure difference.
