Opened up an old 400 - what is this???

So, I took some measurements and did some math on this cast iron turd. With the pistons .120" in the hole, .039" gasket, and 90 cc chambers (906s), this beast is right at a whopping 7.4:1 compression. LOL!!! I should be able to start this turd with a coil of rope once it's back together.