Help with decking or not?

MoparMark91 said

So im in the process of building a 340 bored 30 over and a 3.58 stroke. Purchased on summit.
Using scat rotating assembly
Stroke-3.58
Rod length 6.125
Piston compression height if im not mistaken -1.675
My deck height
LF-9.606 RF-9.600
LR-9.601 RR-9.610
I understand my deck height is not squared up, so my question is if i decked the block to square it up to 9.600 what would the set my Compression ratio at? My goal is to not exceed 10.5 to 1. Hoping i could get some input guys my block is at the machine shop.

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You will have to end up measuring to find your true compression. If a piston for example is advertised at "10:1", that means all things measured and AS ADVERTISED from the factory. So, if you just sling it together without decking for instance, your compression will be lower, because Chrysler always had higher than spec decks. If it was mine, I would deck it to spec, making SURE the shop knows how to parallel deck. That means the deck is supposed to be flat and parallel to the crank center line. If the shop cannot do that or they act like they don't know what it is, find that shop that does. The block is the foundation for everything and if it is off, you will just build an out of spec engine.