Not from or in IN, but welcome to the forum! Since you went from a Mustang to a SHO you're going to have a lot of weird experiences, esp. if it was a GT. The SHO will never have the torque that a GT does. Ever*. A GT will never have the top end that a SHO does. Every GT I've ever seen that revved to 8k RPM blew'd up.
Most people with SHOs focus on handling and braking. This is because, frankly, getting more HP out of the SHO engine is like getting more money from a GM bean counter. It can be done, but a Holy Hand Grenade is helpful. I would focus on the brakes; they are dangerously underpowered from the factory. You will notice if you go out and stomp on them; after about the second 60-0 stop, they will, for the most part, cease to function.
You will want to do what is called the 11.6" upgrade (so called because you will increase your rotor diameter from 10.9" to the 11.6" brakes used on gen 3 SHOs). For this, you will need a set of brake caliper brackets stamped "FN74" (I happen to have a spare set of these), and a set of 11.6" rotors from a 97-99 SHO. Yes, gen 3s were from 96-99, but parts store catalogs are so hopelessly f***ed up for the 96 that I don't use it.
You'll also want 96-99 brake pads, which are of the 598 variety, instead of the 601 variety for the gen 2s. if you look at the part number it'll make sense. You will reuse the stock calipers and lines, which means no fluid work necessary, though this would be an excellent time for a bleed and flush. You want the 598 pads because they are larger and will take better advantage of the larger rotors.
You'll also want to do a 60K service, which is a doozy if you're not familiar with engine work. go
here for a lot of GREAT walkthroughs and pictures on how to do various maintenance projects. The more maintenance you do, the happier your SHO will be, and the less it will leave you calling GEICO for a tow truck.
Overall, though, you came to the right place for SHOs. This forum has saved me, I would estimate, more than $10,000 in labor costs over the almost 5 years I've owned my SHOs, and it has enabled me to know more about SHOs, and cars in general, than I would've ever imagined.
Five years ago, I couldn't tell the difference between a fuel pump and a fuel rail. Now, I work on peoples' cars all the time (sometimes for money) and have become the "car expert" at work, and I owe it all to this forum... hopefully you can get the same level of benefit from it. Again, welcome!
*forced induction notwithstanding