Tom, first congratulations on obtaining these rare blocks. It's truly amazing parts like this, un-machined are still out there in the nooks and crannies of the Pontiac world. Looking at your pics one item really stood out to me. I am surprised it appears the area where the main caps would bolt-up is a cast-in area with voids from a core? I would think they would just be drilled and tapped into the solid aluminum? I didn't see any partial bolt hole locations anywhere else on the casting. The two primary machining datums for the block are not located on that block. From the factory, the large hole on the pan rail where the later model starter pad is and the one on the front face near the cam bearing area are the first two machined items I think. Dimitrie Toth could probably verify this since his father and he both were "on the line" for decades during machining and casting. You will have a wonderful time working with that hiustoric hunk of aluminum. I am pretty jealous as well.
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