I was gonna rebuild the engine in my 2000 GT, but I came across a used short block for 500 bucks. I just threw my heads on it and slapped it back in the car. Just an FYI, if you do a PI swap on a Non PI block and raise the compression; you may have to run high octane gas. I've heard people say they never had a problem with 87, but a buddy of mine did it and unless he had 93 it would ping like crazy. Even with the 93 sometimes it would ping pending on the quality of gas. Food for thought. And good luck!
2000 Mustang GT-Former giggle gas addict
1990 Mustang GT w/ Vortech V3
***resident gun idiot***