Ahhh, yes, GM reworked the motors alot in those years. 91 "c" motors had a 1 piece aluminum intake. 93, the L motor, they reworked the intake to a aluminum lower, and composite upper, and tuned the intake to allow the engine to breathe easier. The EGR valve was moved to the front of the exhaust manifold as well.
Well, stuck the 91'* motor into place, removed the intake from the 93, and discovered GM redesigned the PCV for 93 as well too. The 93'* heads have holes for the PCV ventilation drilled in the heads, whereas the 91 has no such holes. So its here that i'm screwed. At this point, I called the machine shop, and priced up some gaskets, and possibly a valve job for the junked motor. Either way was gonna run me over 300 dollars, and i'd be better off just getting a junkyard motor. I also thought of putting the pac in the rocker arm cover, and running it to the intake, and getting a regular pcv valve.
In the end, I ended up removing the pushrods, and drilling the holes where the pcv goes, right in the heads. It goes right into the rocker arm area, so I figured it would not hurt. I bet i'm the only one here who has done such a silly mod!!
2009 Pontiac Vibe AWD 2.4
1993 Buick Park Avenue 3800
1984 Chevrolet Citation 2.5 liter four.