Better off picking up a cheap v6 Mustang then since youd be changing alot of shit anyway. Crossmember, tranny, wiring, etc. None of it on a 5.0 car works with a 4.6.
Mustangs with blown up 3.8’s are cheap. The only additional swap youd need to make would be the rearend but theyre not expensive and bolt right in. V6- 7.5, v8- 8.8.