Just about EVERY 460 that rolled out of Lima came from the factory with a 600 CFM carb. I'd say with your mod description that you'd be on the high side of acceptable.
Hello, when I first purchased my rebuilt stock 460ci I put a Holley 670cfm street avenger carb on it, It ran Very well and was quite good on fuel, hope this helps.
thanks boys I was going to rebuild my 87 but i bent the frame and the firewall ripped where the clutch sits. and this 670 was origanly going on the 302 f.i converted to carb until i had the old lady engage the clutch and realized the gaping hole lol so now iam going big.