Dave...My Edelbrock 1406 works quite well my my slightly modded 340. If I wanted more performance I would step up to a larger carburetor. I bought my 1406 at a swap meet for 25.00 and put a kit in it. It runs just fine without dropping 500.00 for a new carb. Perhaps something the O.P. to think about? A good friend of mine here who is a 4-speed junkie once said it is real easy to spend someone else's money here. Just a thought...