you should not have to go with smaller jets on a 600 CFM carb with a stock engine?
I use to run some various Holleys on a quasi hot-rod i had at one time. Mostly stock 350 , a holley 600 ran very well, later when added a completely different modified engine went to a 750.
I agree with your advice or whomever made the point about make small changes at the time. Seems like you would want to get your idle scquared away first.
I'm guessing on a stock engine that one or two jet sizes would be as much as even would make sense to do. I would think a 600CFM carb would power a stock small block just fine, without modification. As i recall a minor change in metering rod or jet size can really get you too much fuel when you can't handle it. YOu would need some steep gears to take the fuel if you changed it much at all as far as jets or I'm guessing this carb uses metering rods on the secondaries like a quadrajet? been a long time since I even thought about carbs.... but it would be nice to have an old school hot-rod to mess around with. I'm thinking that might be one of my future projects.
----------- Elbert snipped-for-privacy@me.com