I have a chevy 261 six... The pcv valve is off the road draft tube and has number ac 1544935... Upon disassembly it looks like it is more of a specific sized orifice as you can get flow in both direction and it doesnt look like there are any moving parts inside.. Is this a true pcv valve system?

In relation it had a rochester carb 7015013 which is specific to chevy 261

Is carb designed/jetted to be used with this specific pcv valve (control vacuum leak)

This came off a running motor so everything worked in present configuration.. Im asking question as ive swapped out a zenith 270 gmc carb (runs great) but am just adding pcv system ... Compatible with zenith carb?