Sorry, meant PCV valve.
When you mounted the distributor, you probably noticed that there was some "play" in the bolt holes. That is, it can be turned a bit clockwise and counterclockwise. Turning it more counterclockwise (toward the firewall) advances ignition timing. Turning it more clockwise (toward the front of the car) will retard the timing.
Advancing ignition timing generally results in increased power and economy (and moves the torque curve, I believe?), but going too far advanced can cause detonation. It's generally advised to use a timing light when replacing a distributor to get it back to factor specs, but you could probably just eyeball it and make sure it's really close to the same position as on the other car.
^ In this image I've circled one of the bolts. If you compare the two very closely there, you'll be able to see if Teal's is advanced or retarded relative to the other one. This isn't the "right" way to adjust timing, but it'll do in a pinch.