How do you install a carburetor on a 1990 Chevrolet one ton with a 454 engine?

Since a 1990 truck has fuel injection, this will be a difficult and expensive task. Everything one the top of the engine will need to be replaced. If it has a throttle body instead of individual injectors the intake manifold, distributor and wiring will all have to be replaced. You will need to decide on what distributor will be used. My suggestion is to come up with another plan unless you have plenty of time and money.