[ReMorton]

....I'll put my 2cnts in. I drive the car weekly and no plans to race it, although may make a trip to the strip next spring to see what it can do.I also have no bias one way or the other regarding engines, this is just my experience.
My car has the Ford Racing Windsor 392, 475 Hp version (z heads). It has a nice lopy idle, is very streetable and goes like hell. I had the car recently dynoed. The shop guy does a lot of hot rod work and has a lot of experience with this particular engine. He commented that it's 'bullet proof'. After the dyno the car has run perfectly.
The Ford Racing catalogue does not list this engine anymore, it's been replaced by the 427. However it's still available, I found new crate @$8400. I also checked around and the install for the Superformance (which is subed out) is around $7k. SO, I'd expect it'd be about the same price for the Backdraft.
The another thing to consider is the simplicity of the install relative to the Coyote. It's tried n true, very little customizatoin, if something breaks you have more options.
Good luck with your project!