Cylinder Head Choice

How does one run out of magnum blocks....????? Or maybe it's the scat kits.... IDK. Could I shell out 3k for a short block??? Probably not.. LOL, I'd end up throwing together another 372.46 318 :D
I want to say they make their own rotating assembly but I'm not positive of that. They're very high production so they need to get hundreds of blocks to even make a run of engines....