Z28 exhaust manifold crack opinion

[Unreal]

The car from which I made my Yenko tribute had factory A/C, and I wanted to retain it, but still wanted it to "look factory", Since the the 840 heads were missing a boss for one of the cast iron A/C brackets, I fabricated a bracket extension to bolt to a manifold bolt, and had it welded to a correct b/b cast iron bracket. It worked, but the fabrication looked obviously welded on. I ground/filed the weld marks off the part that did not look cast, and then, with a corner of a file, "pinged" it several thousand times. I then sanded it to sort of soften the ping marks. The result was almost indiscernible from a sand casting, especially after I painted it with Cast Blast.