Vacuum hook- up for power booster

For a 73 with a straight six, can I tee into the line for the pcv valve for the vacuum or do i connect it somewhere else??

You could do it that way but the cleanest way to do it is to go buy another vacuum fitting for the intake manifold that has an additional nipple on it.

http://webpages.charter.net/zjww5226/Nova%20Power%20Brake%20Booster.jpg