thermoquad manifold, do i need these ?

I have a stock spread bore thermoquad intake manifold on my 360, looking inside my manifold I notice I have whats called egr floor jets inside my manifold. since I'm not running egr stuff in my engine do I need these ?
blocking intake exhaust will not affect egr. system, is has it's own passage. it comes out next to carb base. which is a huge vac leak!!!! block it down in the floor of manifold. then have no problem with vac leaks .