Not true, you can get a 350 front bumper for a GT/Eco that is meant to work with the stock hood.
https://www.ebay.com/itm/Front-Bumper-Retrofit-Conversion-for-Mustang-15-17-GT350-Style-Grille-Spoiler/254299770906?fits=Year:2015|Model:Mustang&epid=8020046631&hash=item3b3572901a:g:ip0AAOSw-9tdLjQI
I I was planing on a way different direction. might do a raptor build next.Not advisable. The Raptor ECU heavily depends on the Ecoboost motor. There was a company who did a supercharged 5.0 into a new Raptor but the harness, programming, and drive mode compatibility was beyond a nightmare and the price of the truck reflects that.