Classic Holley carbs have been a staple for rodders around the world for decades. They're the perfect performance upgrade for stock to mildly modified vehicles and have that classic Holley look. Holley's 0-80531 has the perfect calibration for GM's 502 crate engine. Dual feed fuel inlets assure you get all the fuel you need while its vacuum secondaries and electric choke make it amazingly universal. Plus, it is Gold Dichromate coated for durability and classic Holley looks. Don't trust your performance to just anyone, Holley is the only modular carburetor company that has been in business for over 100 years and has powered every NASCAR champion since the 60's.