…and to build on this, these years of Mustang when stock plus 6-8psi will run pretty close to the full bolt-on NA 302 Fox body, so figure a pretty solid 12 second car with not too much problem.
Another thing to possibly consider is the 5.4 swap. A friend of mine from my days in MN was one of the first to do said swap into a '99 GT auto. Total cost was $900 for the project! It’s late right now but I’ll try to dig up some more info on this as he ended up doing a full write up for 5.0 Mustang and Super Fords magazine a few years back.