The 86'-88' stock 5.0 cam was the E5ZE cam (85' 5.0 4v carb motors had them also). It has .266 intake/ .266 exhaust lobe lift compared to the .276 int./.266 ex. lobe lift of the 89'-95' 5.0 cams. Ford actually decreased the ramp rate of the maf 5.0 HO cams. I guess that is why they increased the lift on the intake side to try to make up for the slower-opening valve. Overall, the early EFI speed density (late carb) cam was the most aggressive stock HO cam. The cobra 5.0 cam has more lift, but it is actually considered a "milder" cam due to other specs. Ford believed that they lost some low-range torque by switching to the gt40 top end. So they slapped in a thunderbird 5.0 HO cam (more torquey) with 1.7 roller rockers. The 93' 5.0 HO computers were also not as aggressive tune-wise. The 89'-92' A9L computers were the most aggressive 5-speed computers, while the 89'-92' A9P were the most aggressive automatic computers. Out of all the them, the A9P is the most aggressive (better fuel/timing curve). I actually switched out the stock C3W auto computer for an A9P in my old 93' mustang, and noticed the idle was smoother and had better low-end acceleration. The main reason for the 93' hp 205 hp rating was the way they measured the power. For that year they added up all of the minor changes they did over the years, such as small cam profile changes as I've mentioned, the puny 55mm mass air sensor, and they had included all of the belt-driven accessories, unlike the previous years. The hypereutectic pistons really don't affect anything performance wise. If anything, it adds a bit more power since they weigh less than the older forged pistons (less rotational mass). They just suck for people that want to use nitrous or forced induction. Other than the ECU (computer) and the material that the pistons were made from, the 93' 5.0 HO motor is the same animal as the 89'-92' motors.
