On mine...I removed the two pieces flimsy pieces that bolt on, and then I cut off the stubs that were spot welded to the shock towers. Having them on there would serve no purpose. Removing them, gives your engine bay a "cleaner" look.
*edit* another reason to remove the pieces welded to the shock tower, is that if you plan to put in a 351W...good luck getting the valve covers off without scratching them. In other words its a tight fit at that point.
Just my $0.02
-Rob "Ricky Bobby"
No one is listening to you, until you fart.