This isn't mine, but it shows the complete PCV system, including the spark arrester in the hoses from valve cover to air cleaner spacer.
http://67-72chevytrucks.com/vboard/s...er#post5805555
In case someone changed or modified your post/bracket, this picture shows that it bolts to the two bolts on the side of the head. My lower bolt is also holding a triangulated brace for the AC compressor bracket. The air cleaner will slope forward, very close to the valve cover to match the angle the carb is mounted. The post is unaltered if I recall.
I tried to find my old tube to get a height measurement, but I was not successful. To work with a 4bbl, I welded a larger tube directly to the air cleaner.
