Looking for advice on a blueprint engine.

Heywodja said
That’s a great idea. I have been reading that the longer rod increases dwell at tdc, thus allowing a little more compression. Uses shorter pistons which reduces rocking in the bore. But puts the wrist in closer to the oil rings. Weird deal is the 396 stroker is a stock bore on a 350 block

I am sure there is some hot rod math out there which tells the story.
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Shorter pistons INCREASE the amount of rock in the bore. Not the opposite. The longer the skirt the more stable the piston is. That being said, I don’t think any of this matter for this application. Like @RustyRatRod said, use the one that is easiest to run on pump gas for a street truck.