[bigblockv6]

I'm using a complete K&N air cleaner assembly that's 14 inches in diameter with a filter inches thick. You do not hook up the crankcase breather tube to a vacuum source, it only goes into the air cleaner assembly on a closed ventilation system. You'll have plumb up a tube and hose that will attach to the base of the air cleaner assembly. It was real simple on my 68 since that year GMC went to a breather cap on the valve cover, all I had to do was cut out a 1 inch hole with a hole saw and install the original type grommet. If you like I can send you a pic of the air cleaner assembly.