"...I wonder if many need to be decked to get desired compression height?..."
Don't know much about those blocks. But, I think I can answer this one. If you want zero deck height, after you install the crank you'll use, you'll then have to measure the distance your rod length + piston pin height will need to be, in order to put the piston top even with the deck.
Doubt seriously that any block deck height can be guaranteed. As least I seriously doubt that the aftermarket block machining is that precise that they guarantee an exact deck height. But hey, if they do, and you believe it, that's great ! That way you can do the math & order the correct rod length & pin height, in advance.
But, I think most all engine builders will want to actually measure the blocks, rather than taking the vendors word for it.
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