BIDDING ON A USED ROCHESTER CHEVY CARB TOP 2GC FRONT GAS INLET COULD BE USED ON A 58 TRI POWER SETUP.  HAS CHOKE AND ALL PARTS ON THE SIDE FOR A TRI POWER.   COULD ALSO FIT EARLY OLDS PONTIAC CADDY DO YOUR RESEARCH FOR WHAT YOU NEED..BUYER PAYS SHIPPING AND INSURANCE.