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I have a 440 on my dyno now and have tested several carburetors on it. At 440 horsepower

Has a Street Demon been part of your testing?

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Yes it has,
It did real well at the 440 horsepower level. When I ported the heads and went with a bigger camshaft, these smaller carburetors were too small.
But on the lower horsepower build the Street Demon 625 was worth some low end torque. It wasn't quite as impressive as it was on my 360 mule though. I think it had to do with the Thumper cam in that 360 having weaker vacuum signal than this 440 with a smaller cam
Keith