I am using the McKinney mounts and found the fittings were very close to the hood catch. Not much room if you ever want to remove rocker cover. I tried to remove and could not do it so....
... I removed old fittings (they are just pressed in), sawed off old boss and had them welded closed, and had a new set of "bungs" welded on.
Then I filed flat and had them powder coated.
I plan on using union with 90 degree elbow on hose running to catch can, but you could use "T" and link them back to original config.