On my '71, I tried a lot of different things with the breather over the years. What I ended up with is keeping the stock connection to the air filter, but replacing the bolt in the front of the engine that gives access to the crankshaft for statically timing the ignition with a hose barb. I then ran a hose up under the tank and seat and out the back. You can feel pressure and vacuum at the hose, but I don't get any oil coming out. I am not getting any significant oil in my air filter either.
One issue with getting rid of the stock hose is its size. Its too big to easily run out the back. Years ago, I tried putting a reducer on it to let me use a smaller diameter hose. Predictably, that just resulted in immediate multiple oil leaks.
Ed from NJ