Does it still have the original '56 Holley 4000 'teapot' carburetor, single or dual canister Loadomatic distributor and an ECZ-A intake manifold? . Example photos below.
Knowing your answers, your intended goal (and ballpark budget) will give direction to responses.
The answer can be a short story, a long story... or a longer story.
If it's original under the hood, the short story is to have the '56 Holley rebuilt, or one just like it if it's too far gone.
Names & numbers for two well recommended carburetor rebuilders. They both are very familiar with the Holley 4000 teapot carburetors. Sal Cicala is a forum member here.
Sal Cicala, (586) 612-1650
or David Arey, 610 703 2014
.