Hello,
I am running a MightyMouse Solutions Catch Can on my 540 BBC. My set-up includes a -12AN dirty side to catch can, and a 3/8 clean side to throttle body with a turbo car PCV valve. This significantly helped my set-up which originally consisted of one K&N breathers on top of each valve cover. Give Mighty Mouse a call, and he can help you with your application. These are very popular for twin turbo LS cars.
www.mmsolutions.com
Regards,
Larry