I generally recommend wide ratio transmissions.
As for the clutch kit, a 98988 is a Powergrip HD, with a sintered iron (both sides) disc. If you don't need a clutch kit for 650 hp, then I wouldn't buy one. There are many other choices.
Solid hub discs are generally not optimal for a street car as they transmit a lot more NVH. The only solid disc clutches I recommend are the twin disc clutches and they are only solid because there's no room for extra goodies. They are also noisier, but they are also organic, which helps with some of the driveability. A great deal of your solid hub discs are paired with some rather hairy friction materials and they will give you an on/off engagement, which is not good.
I also try to pair factory style applications with Long style pressure plates. Most people think that Long style plates are always harder on the clutch leg, but that's not the case now. In the 60's/70's, the clutch plan was to put a disc with a pressure plate that had a ton of clamping force. Now days, we balance the pressure plate clamping force with different materials. In a lot of scenarios, the Long style pressure plates actually have less clamping force than some of the diaphragm plates out there. The RAM HDX/Powergrip/Powergrip HD are 2200 lbs I believe.
Obviously, the clutch kit will also depend on your flywheel. Your aftermarket flywheels from Ford Racing, McLeod, and RAM will all have 11" and 12" patterns on them. Factory flywheels will depend on which engine the flywheel came off of.