That clears up the chassis questions.
On the dished piston; I'd probably avoid it. If your just using the car once in a while, you'd just be fueling it the same way you do now. I favor long term reliability and potental on the bottom end as opposed to getting power or cheap gas now. If you go with a dish, what happens to the quench area and the flame travel, and how does that limit future things like aluminum heads or cam choices? I ran a 224/234 @ .050 on a 400, that motor lasted a while with a stock rods and bolts, but I'd probably still be hot dogging that motor now had I had a better bottom end. And you could also talk to someone about dynamic compression and the oct required - you may be killing two problems(power & fuel) that way, as opposed to creating potential problems for building power(inefficient combustion process). But on the other hand, with the stroker, your high cr 400 heads with more cu in under them, the compression is going to just jump outta useable range, and you'll not be able to use it till you get new heads. Hmmm...
Maybe some of the race section or engine builder guys will come over and help with fuel, cr, and your goals. I'm near the limit of my knowlege on these things.
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Jon B 
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