The throttle bodies on this page are all designed for multi-point fuel injection
systems. They require an intake manifold that can be fitted with fuel injectors. They may
have accommodation for secondary fuel injectors but those that do are not intended to be
used in applications without primary fuel injectors (normally mounted in the intake manifold.)
For installing fuel injection onto engines with carburetor-style intake manifolds (without
fuel injector bosses) take a look at these
TBI Throttle Bodies.