I removed the intake manifold and found that it is missing the leaf base. The manual says that there should be1. intake manifold2. gasket3. leaf base4. gasket5. leaf assembly (3)In my (working) motor 2,3 are missing, leaves are attached directly to the manifold with one gasket. Is it OK (just different modification)? Should I get the base and another gasket? Please advise. Thank you.