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If you have a Holley 6239 on the engine, get it rebuilt/restored.
If you don't have an original Holley, find one.
The correct Holley is regarded as an important item for a LT1.
Curious what is wrong with your existing carb, or is it not the correct one currently on there ? If it's correct / why not have "LARS" rebuild it ? If not I can vouch for Allstate Carburetor in Central Islip. I have bought many parts & carbs from them over the years as they are very close to where I live & i can just walk in !