Don't waste your time or money on a 9000 series. Get a 6000 series. End of discussion. Period.

Also, since you're putting on one a 318, get one for a small block. You will be happier with it than trying to make a big block carb work. This will limit you to 73-74 340/360 carbs but you will have much better luck with one of those. Get a rebuild kit, they are not tough to rebuild. They can be tricky to tune however.