The factory ford 5.0 block is generally accepted to be at tad on the week side for high HP builds.
You can buy a Ford boss 302 block with a 4.125 bore. It is stronger too.
https://performanceparts.ford.com/part/M-6010-BOSS302
By the time you find a used block, clean it up, bore it, hone it, etc, you will likely have similar money in it.