Assume you can get it for $7k, you get a brand new CG 6 bolt block, steel crank, aluminum heads, roller cam, EFI ready that makes 505hp/515ft lbs with headers and tune. Then consider it's OEM quality, modern gaskets, and assumably gets better mileage than any older platform that's similar displacement.
Big question will be if Ford creates a standalone ECM setup like they do for the Coyotes, which would run an extra $1200 or so.