5.0 clutches are bigger than the 2.3's I think. Many companies still make good clutch kits for 2.3's though. I know centerforce makes one although I haven't heard too much talk about it on this board for some reason.
if you have a stock 2.3 you will probably be happiest with a normal stock clutch. A n/A 2.3 doesnt have enough power to slip the clutch anyway. A good upgrade though would be a 2.3 Turbo flywheel, clutch, and PP. A centerforce is a bit overkill for a 100hp car.