Which PCV Valve?

[Orion 762]

I've got a '71 Cheyenne, 350 SB, but with:

Headers,
Edelbrock intake,
Holley 650 cfm double pumper (Model 4165, List 6210-3)
HEI

I added a PCV valve recommended by Autozone, based on their "lookup" of the original engine. Tonight I noticed "at idle" that the PCV valve was rattling a LOT, giving a very rough idle. Seems that the Holley carb. is really pulling hard on the valve at idle . . . the valve is pulled "all the way up" and I can still get a strong suction on the bottom of the valve using my thumb.

When the valve bottom is plugged (with my thumb), the engine smooths out. Remove thumb, and I get rough idle.

I suspect either a BAD PCV valve OR maybe Autozone sold me the WRONG ONE. Seems to me that the "correct" valve should be based on the vacuum level from the carb.

Can anyone recommend the "right" PCV valve to use on this engine setup? Which ones work good with a 650 cfm Holley??

Regards . . . Orion 762