you can buy a fitting that goes into the sump plug, i've done it with my escort, you would need to check if the gearbox will be in the way on a 2wd though.
i would'nt breathe from the rocker cover, here's why.
http://www.grahamgoode.com/cosworth/

also dont pipe the small angle pipe on the tank to the turbo side as a return, because that side of the block is breathing so will be trying to push all the return oil back into the tank.
that pipe needs to be below oil level so theres no pressure