Is there a carburetor that will mount on a throttle body intake on an 1989 Chevy van with a 5.7 liter engine?

Yes, it is possible to mount a carburetor on a throttle body intake for a 1989 Chevy van with a 5.7-liter engine, but it requires an adapter plate to ensure proper alignment and sealing. This conversion typically involves replacing the throttle body with a carburetor and may require additional modifications to the fuel delivery system and ignition timing. It's advisable to consult with a professional or specialist to ensure compatibility and optimal performance.