Here, read about these. Read ALL of it. There are some drop downs further down the page. I'm a BIG fan, one, because I have one of their 450s on my slant 6 and it runs GREAT and 2 they are a good bang for the buck. Read about all their adjustability. I'm not tryin to say run out and buy another carburetor. You may have constraints to work within. It's just a thought for now.