Ok, help me understand this a little better. I've got a 302/350 hp engine from the Engine Factory with the standard 650 thunder series Edelbrock Carb. If I'm reading the Holley specs right, I should be using mechanical secondaries because of my car's low weight combined with 3.73 rear end and low first gear gearing. The Ed carb on the engine has vacuum secondaries. It wants to die on sudden stops and hard cornering. Have checked the float levels and all is fine. Timing right on 15 initial, 36 total. It also pauses/sputters momentarily on flooring the throttle in first gear. I want to smooth this thing out and am not opposed to chucking the Ed and getting a Holley 670 Avenger or any other carb to eliminate the stumbling. Will mechanical secondaries solve the sputtering issue? Or should I just keep tinkering with this carb? Would prefer to take one out of the box and not have to tear it apart and tune every circuit. Or am I missing something on the Ed carb?