[davids2toys]

I emailed the previous owner. He said those two 12 point bolts came with the Blue Thunder manifold. They are special 12 points because it is the only bolts that will fit in that confined area. He said he tightened them with a 12 point box end wrench, carb OFF.
He got the fuel log a few years later from one of the builders and just used the same bolts

Next move, carb off!