Are you running open headers or with a exhaust system..
if running a exhaust system take the evacs out(both
sides) and run open breathers or 1 breather and a PCV
Also try blowing thru the breather to see if you can..
I have a pair of breathers on my 416 and I couldnt
blow thru them and had to pull some of the material
out of them.. you should be able to blow thru them easy
and blow thru them from the engine side(the way the
air would be going)