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In this month's Hot Rod magazine, there is a crate motor comparison with a 331 Boss from Ford Racing. It dynoed at 530 horsepower @ 7,200 rpm/407 ft lbs of torque. I don't know what it costs, but it sounded pretty cool.
 
I think it's interesting to note the intake valve size is 2.02. I seem to remember the 69 '02 was a 2.23 and the 70 '02 was a 2.19 intake valve. Nothing like admitting 40 years later that your intake was between .17" and .21" too big. And this is a 347 cid!!