PCV system maintenance interval?

[ew1usnr]

What is the maintenance interval for a 1963 V8 crankcase ventilation oil separator?
See: Oil Breather Screen-Mesh Filter #C2OZ-6A631-A for 62 63 64 65 Ford Mercury 221 260 289.

Oil Breather Screen-Mesh Filter #C2OZ-6A631-A.jpg

I had been under the impression that my PCV valve #C1AE-6A666-F was supposed to be changed every 30,000 miles.

1962 63 FORD PCV VALVE NOS C1AZ-6A666-A 221 260 289 FALCON FAIRLANE - .99 1.jpg

Kemparts PCV-40 C1AE-6A666-F.jpg

I read in my recently-purchased book "Small Block V8 1962-1969" by Bob Mannel that Ford had recommended that the PCV valves were to be disassembled and cleaned every 6,000 miles.

Small Block V-8 1962-1969.jpg

Oops. My PCV valve has been in there for over 16,000 miles with no maintenance.
I will take it apart and spray it with carburetor cleaner this morning.