Hey Ford enthusiasts! If you're working on a classic Ford with a 144, 170, 200, or 223 inline 6 engine from 1957-1962, this single barrel carburetor is exactly what you need. It directly replaces the Holley model 1904 (the only difference is the choke pull, just so you know). The specs are spot-on: 39.5mm intake side inner diameter, 53mm choke air horn inner diameter, 58mm outer diameter, and 75mm between mounting bolt holes. Before you order, definitely check that your old part numbers match - we're talking 144170200223 - and make sure the 75mm bolt hole distance matches your current setup. This isn't some cheap knockoff either - we've been in the auto parts game for years and put serious effort into making carburetors that actually work right out of the box. Every component is precision-tested and adjusted so you get reliable performance from day one. Perfect for your 1957-1962 F100 trucks or any Ford product with those classic inline 6 engines. If you're not 100% sure about fitment, just reach out - we're here to help you get the right part!