Some points...
This new "5.0" is 4952cc, 3cc bigger than the 302 "5.0", and yes it was engineered that way. It has absolutely NOTHING in common with the turds that were the "Mod motors" (you know, like the one I drive everyday). Bore spacing and deck height are the same in order to use the same production line but not a single part interchanges, it's a clean-sheet design.
Also the new "5.0" is lighter than the 4.6 and is within 30-40Lbs of a dressed aluminum LSx. It is slightly lighter than an N/A iron block LSx. 412HP/7000RPM redline/390FtLbs is damn good from 302 cubic inches!! The GM LS2 made 400/400 from 364 (which is still one of my favorite engines ever).
Also the "Cammer 5.0" FRPP engine is a Mod Motor POS (sleeved block for racing) that is overpriced and underpowered.
The new Mustank is ugly as all get out, but that engine is gorgeous. I hope they get cheap second hand in a few years... Food for thought, the current 300HP Mustang goes 13.4's in the 1/4, add 112HP/100TQ with no weight penalty stone stock and see what happens... The 05-06 GTO was 400/400 @3650ish Lbs and did 13.0's with worse gears and IRS. The 'Stang is lighter, SRA, and geared better (especially with Track Pack). I expect 12.8's minimum...