Because you don't need any aftermarket blocks for the 4.6L or the Coyote. This isn't like the pushrod days where the webbing was not much better than paper mache. Any aluminum 4.6L block will take 800+, even the WAP which ppl seem to think is weak but ask anyone to go find a case of failure where the actual block let go because of insufficient strength and you won't find anything. People use anything from stock iron to teksids to aluminators and even WAPs for big power builds with no issues at all.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.