They look like parker peformance intake tongues (what I run in my 4V o/c's).
I have a set of 4V c/c's that have a high port exhuast block like in your picture. My exhuast ports are virtually square though. They are not much good for a street head cause where the head stud goes through the soft alum port block will squash, there just isn't enough meat around the head studs @110 pound torque + operating temp of exhuast port.
You need custom extractors to make the most out of 'em and even then it's gunna be touch and go if youve gotta fit 'em in between falcon shock towers.
You need longer head studs or bolts for the exhuast side as well.
Auto Power Parts in Brisy used to do 'em for 750 per head but doesn't do 'em anymore (no demand since all these new alum heads).
I'm pretty sure Superflow in sydney still do this mod.