A TBI intake manifold is designed to fit on a specific engine, and the 1979 350 and the 1990 350 TBI are different engines. The 1979 350 is a carbureted engine, while the 1990 350 TBI is a fuel-injected engine. The TBI intake manifold has the fuel injectors mounted in it, while the carbureted intake manifold does not. Therefore, the TBI intake manifold will not fit on the 1979 350 engine.
