That is the Heavy Duty clutch kit from Ford Racing. It does not come with a flywheel, aluminum or otherwise. One of those will cost more than the kit.
The $210 ($209 & change) Heavy Duty clutch kit on Summit is the one with the reduced pedal effort, and is commonly known as the "King Cobra" clutch kit. It has 30% less pedal effort vs the other Heavy Duty unit, and supposedly 10% less effort than a stock GT clutch pedal. The other Heavy Duty clutch kit is ~$202 on Summit. That cheaper kit has the full pedal effort, not reduced like the "King Cobra" unit, but it does have the same holding power as the "KC" clutch kit. If you got that cheaper kit, you would increase the pedal effort of your clutch, vs stock, for sure.
This clutch kit only comes in an 8-bolt flywheel & 10.5" diameter clutch variety like is present on the Mustang GT until Mid '01. I have heard around the Internet that occasionally the 6-bolt flywheel & 11" diameter clutch combo makes an appearance both later and earlier than it should, on occasion.
I have one of the King Cobra units going on my car this Monday, when the clutch kit is supposed to show up at the shop. They already have my car apart - just waiting on the rest of the parts to put it back together. I understand it is a good unit when it is installed properly. There is a lot to installing it properly, however. Summit has the Ford Racing document that details their installation guidelines. They don't offer a warranty on the clutch because of how many they had received back as "bad" that were just installed poorly, it would seem.
That might be more info than you wanted, plus I have no idea what a '97 GT is supposed to have. However, since you have a 2000 GT engine in there, you might have exactly what I do installed at this point. I just did all this research before getting my clutch linkage issue solved at the same time I get an upgraded clutch put in.
I would like to spray a bit of nitrous eventually, and I certainly don't want to do that on a stock clutch.
