I have 2 Holley 4bbl carbs. I was told they were 450 cfm. Idont know for sure. They need rebuilt . 1 carb has base plate missing. The other is complete. Will get #'s off carbs tomorrow. $100 for both including shipping to your garage. Also 2 sets of 292 C heads including rockers. took 1 set off my bird. Truck oil pan, gen,starter, any offer considered