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that prob be the least of your worries id say...

plumbing back into intake = oily air running through your AFM/cooler/turbo/intake... thats the 'environmental' thing to do...

...catch.....can.....

I am planning to make a catch can and plump both the tappet cover breather and the block breather into it with one of those small filters.
Just out of curiousity, what filter will be the best for the application?
The one's that have a wool kind of filter element or the one that have a paper element.

If you are cornering really hard oil can come out of the breather too. That is part of the reason why you need a catch can when racing (the other is incase you blow your engine up). My dad was out on the track, going around a hard right hander, and all of a sudden the whole track was covered in black smoke. We didnt know what had happened, so it was towed back to the pits, we put the breather into a coke bottle, and it was partly filled by the end of the day. true story.

If you can get your hands onto a Datsun 1000
oil filler they have a breather built in. This means that you can weld the oil breather up.

on the 1000 engine i have back down the coast it had like a pipe that ran down the side and out onto the ground