Power advantage between Ford 351, Mopar 340 and Chevy 350??

I agree about the Cleveland. With ports and chambers like this, the 340 would get left behind at high RPM.
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I also had a 70' Cleveland 2bbl in a cougar XR7 and it ran well for such a heavy car. Being a 2bbl my 340 Dart would take it to the cleaners but with a 4bbl. I'm not so sure, being the Dart is lighter, possible. UP & UP, Cleveland is my bet.