On the passenger side valve cover, under the intake plenum. Look at the plenum, you'll see 3 little vacuum lines going into 1 plug, directly below that is a larger vacuum line, that is the PCV line. I've heard of people being able to pull the PCV out with a pair of pliers, but the only way I could get mine out was to pull the intake plenum.

88 4R, 350 V8, R150 5 speed Sold <...uot; />
97 4R, stock, daily driver
98 Sienna, kid and dog hauler, wife's ride