egr? to eddy rpm intake match up on a LA318?

The holes in the center of the heads are referred to as heat cross overs.
They are designed to heat the intake for better fuel atomization.
Fel Pro and others make an intake gasket that blocks the heat cross over.
Many dont like the high heat to the intake from the heat cross over,so they block it off.
Depending on your climate,and what your doing with the car will determine if you will want to block it off or not.