Oil Catch Can Advice

[sinny]

Hiya all, I have a 2 port Oil Catch Can I am looking to fitting to my 2.5l hawk, Been reading quite a bit on the net and found some say you should keep head vents and crank vents seperate but some say it doesnt matter?, also should I use the second port to feed back cleaner air to intake (maintaining pressure), or vent it out back of car and block up the original intake pipework. What I was planning to do was take dirty head and crankcase breather into 1 port of can then pipe the 2nd port to intake and block either the crank or head return also blocking up the pcv port. Checking the engine where the head vents come up there is a 2nd larger pipe next to it, is it just balancing the pressure between head and crankcase? if so just ignore that 1? thnx for any help/advice guys.

Stevie