E58 400 plus HP Dart sport build

So starting a little map of my build out. Basically I'm duplicating the Engine labs 360 build but with KB107 pistons. I'm curious what others are doing for flattop pistons. With J head I should be be at 10 to 1 about it just below it. Not decked yet but I figure that and head gasket thickness will dictate that as well. Here is the link below I have a Pro Form 4250 850 CFM instead of AVS but same build otherwise.
Modifying And Testing A Dodge 360-Cube LA Small-Block On The Dyno

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Did you mean E85 in your title?