This distributor is Ready-to-Run meaning that you simply need to install it in the engine and connect three wires to fire up the engine. No external ignition controls are required with this distributor because it has a powerful module built into the housing. This module produces a stout inductive spark that will improve the overall driveability and performance of your classic Chevy. Just above the maintenance-free magnetic pickup there is a chromoly mechanical advance assembly that provides smooth advance of the timing and is easy to adjust. There is also a vacuum canister for cruisers. If you're concerned about looking stock, the distributor accepts a stock-style points distributor cap. If you're a 348/409 fan, you'll be excited to learn that you can get a high performance distributor for your classic Chevy engine!