I've asked a lot of questions about this carburetor. I had a lot of good reviews and a few bad ones. I ordered it 6 days ago and arrived early. I followed the directions given for installation. In 35 degree weather, I hit the gas pedal three times and it fired with a kick as if it were fuel injection. It revived my 1977 351w Ranchero! I'm impressed with this carbohydrate. I once had an Edelbrock 600 and had great starting difficulties, the difference between day and night. I will buy another one and put it on the shelf for my next project.