any weber needs an adaptor kit to install it on either motor. If your truck is stock, that is too much of a carb for it, Look for a 32 / 36 dfev / dgev 2 stage progressive carb instead. You will also need to install an electric fuel pump to feed it, as the stock mechanical one will cause you problems. Before you go replacing the carb, have you replaced the fuel filter? If plugged with rust it won't get gas to run.