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Why is stroking out of the question?

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My intake and exhaust manifolds are limiting factors... I don't want them choking the extra cubes. I'm also building a clone and starting with nothing... I could build a 440 if I wanted too, but I want the smaller displacement faster revving engine.

I hoping to fit the car with the one of the new Passon 5-speeds, with a 4.10 Sure Grip out back.

I'm also not opposed to aluminum heads vs. ported stock. I'm looking at "gasp" Stealth heads (I'm fully aware of their issues with valve locks) for no other reason other than that they appear fairly stock on the outside.

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In my opinion you are looking at the stroke wrong, the stock exhaust manifolds and intake limit the peak torrque and HP RPM,I would at least think of using a 440 crank on your build That makes it act like a 426W Or better yet a 440 crank offset ground to 3.91 stroke and use the BB Chevy rod journal size and cheaper good quality H bem steel rods The 400 block with either the 440 crank or the offset stroke 3.91 crank will make a really good combination for what your doing I've made 500+ HP with a pump gas 440 based stock stroke motor with iron heads a bunch of times, add a set of aluminum heads and 540 HP gets in sight very easily Good luck on your build, it is very smart to think of what to do and use before starting