Here's an ecoboost 2.0L swap. So much room in that engine bay with 240HP and 270TQ.
https://chromjuwelen.com/network/237/190322-1986-mustang-svo-with-ecoboost-inline-four.html
https://chromjuwelen.com/network/237/190322-1986-mustang-svo-with-ecoboost-inline-four.html