Carmine I use the stock one in the tuneup parts for tune ups. I don't have the number. I just looked up FE motors from 1980's and they are all the same and went with that. 3/8" hose to the back of the throttle body housing. Works fine on my motor. I don't have a big camshaft in the 482 and have vacuum of between -12-13pounds at idle. I think if you have a huge camshaft, the PCV may only work partially with a poor vacuum signal. This is the reason some of the guys run vacuum pumps on there car. Let me break this down,
Vacuum pump in the vacuum line for brakes help keep enough pressure for a good pedal. it also assist motor to not show a load on the vacuum system.
Vacuum pump a dry sump or wet sump system help rings to seal better to the cylinder walls, controls
oil mist in motor and returns it to liquid forum in pan or tank depending on setup. Also seals motor from leaks going out ward or inward. For a street motor, you want to run no more than 10-12 pounds of negative pressure in the motor. any thing more and you may start to suck
oil through seals and have issues of drivibility.
Stock PCV valve for your motor and see how it runs. Rick L.