Here is an interesting build. LS7 Chevy, 440 inches, cam is hyd roller with 244/257 duration and it makes 700 hp at 7000 rpm. I think the difference is the heads. The LS7 heads are better than any Mopar head except maybe something exotic like a W8. I'm still surprised that this LS7 was able to make 700 hp at 7000 rpm with only 244/257 duration. I guess we have to assume that the article is correct but I think it would require at least 10 degrees more duration to pull to 7000 rpm if not more.

https://www.hotrod.com/articles/tested-442-cubic-inch-ls7-dry-sump-stroker-700-hp-pump-gas/