* Distributor Curve: Crate engines often come with a distributor curve optimized for their intended application (e.g., a performance-oriented curve). A '57 Chevy's needs will likely be different; you'll want a curve matched to the car's intended use (street driving, racing, etc.) and the rest of your engine's components (cam, carburetor, etc.).
* Mechanical vs. Electronic: The crate engine may have a different type of ignition system (HEI, electronic, points) than what your '57 Chevy's wiring harness is designed for. You may need to swap in a distributor compatible with your car's wiring and ignition system.
* Vacuum Advance: The vacuum advance mechanism on the distributor might need adjustment or replacement to work properly with the carburetor and intake manifold in your '57 Chevy.
In short, while *technically* you *could* potentially use the distributor that comes with the crate engine, it's highly unlikely to be ideal. It's best to plan on replacing it with a distributor specifically chosen for your '57 Chevy application to ensure proper ignition timing and performance. This often involves considering things like the camshaft profile and intended RPM range. You might even need an adapter to properly mount the distributor. A professional mechanic or experienced engine builder can help determine the best distributor for your setup.
