My '68 cougar has a 302 from 1974. I'm not sure if this engine has an EGR valve or not. I'm installing a Edelbrock 2121 performer intake. It was a gift from my cousin who had no idea the engine was from '74. The box says that it is a non EGR manifold. If my engine has an EGR valve, can I remove it to make this manifold work? What will happen with the engine if it's disconnected?