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All the flathead Fords of the 8BA era (1948 - 1953), had Holly integral fuel delivery/ignition systems. The carburetors had vacuum systems that controled the spark timing of the distributor. If the carburetor is replaced with a unit that is not set up for Holly Load-O-Matic ignition, then some other design distributor must be used. Mallory all centrifugal distributors or modified early GM vacuum advance distributors are the easier ones to use. The GM would use manifold vacuum with an adjustable vacuum advance can installed. The flyweight springs and advance unit can be taylored to work well with any flathead. There are still a few folks that do GM distributor conversions. The old Mallory types for flatheads are harder to source now days but they are out there.