OK, apparently what I'm looking for is called a crank case breater filter. This is the piece that clips into the side of the air cleaner and accepts the black tube that runs down to the driver's side crank case.

They're readily available for most GM cars. Question is, will any of these work for a '68 442? Not sure if anyone out there knows....

 

Hmm. Well I'll be.... http://frugalmechanic.com/auto-part/...-breather#fits

I'll keep this post as I know a few others were wondering about this.

 

RockAuto lists that filter element from five different vendors, ranging in price from $1.54 to $5.78.

 

I purchased mine at Advanced Auto Parts.

 

I replaced mine with a pcv valve

 

the breather piece, not the filter