Correct me if I'm wrong, but doesn't the oil go from the block, up past the head bolt, then along the bolt to a passage that goes up to the pedestal? I would think it'd be pretty difficult to get a piece of wire down past the head bolt and into the lower hole that lines up with the hole in the deck surface. Only way to know is to pull a head and check things out that way. I think the magnum head gaskets are drilled, but in case they aren't and you aren't sure if you have magnum gaskets or not, the magnum head gaskets have areas that the pushrods go through. Separate holes for each pushrod that is. If they misaligned the holes in the cam bearings then the cam won't be receiving oil either. If I remember correctly there's three holes per bearing on #2 and 4, so as long as the hole up from the main lines up, you'll have oil to the deck as well. I think I would disassemble the whole engine. Doesn't sound like the most trustworthy builder.