Holley 500 CFM 2 Barrel #0-4412S on a Slant 6

Great carb- fun to work on and make good power. They are a tad soft on the bottom, which is where the 50cc accelerator pump comes in handy. It has such a big pump shot if you need it. TBH I'd go with the 350cfm unless it was a race car -had the 500cfm/Xcelerator on my 273 and it killed low end torque(duh...)