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2nd Gen front rotors are somewhat larger diameter. As said, the whole front strut assembly is required as the caliper mounts a bit farther from the hub center. The rear calipers have a very poor reputation, although I've had ZERO problems with them on my two Luminas. As far as braking power is concerned, the big issue on my two ('92 and '93) Lumina Euro 3.4s were the VACUUM POWER BOOSTERs. Both cars had high pedal effort, poor braking performance. That seems to be a common complaint on the first-gen cars. It wasn't the front calipers, rotors, pads, neither was it a problem with the much-maligned rear calipers, or the rear rotors/pads. The WHOLE problem was the power booster. The boosters on both cars "partially" failed leading to reduced assist (almost none, yet not totally dead.) The boosters had NONE of the usual symptoms--didn't leak vacuum, held vacuum until the check-valve was removed, didn't hiss or make ugly noises. There just wasn't much assist. I installed "rebuilt" vacuum boosters sourced from CarQuest/Advance Auto, and both vehicles were immediately fixed. If I remember correctly, the brake light switch on the '92 gave me more trouble than the (updated design) brake light switch on the '93. It may be that the better solution is to install 2nd Gen boosters on the 1st Gen cars with vacuum boosters. I guess the 2nd Gen vacuum boosters are larger-diameter.

If going through that work, unless wilwood is the only option, id try a brembo setup before wilwood. Wilwoods are , uh, not that great, and have really small pads. Of course that may be why they are better for adapting to the w bodies. Im literally typing this while standing next to a race car im about to get into that has wilwood brakes, getting pads installed for me to bed in for the team