I have a 2000 3.0 V6 Ranger, but equipped with the automatic. I can cruise easily at 70, but I don't push this truck; it has 215K currently, and still drives great. The acceleration is not anything to write home about for sure. I think your truck is running fine. I've not pushed mine to a limit, so I don't know if 74ish is it's max. I drive it mostly on weekends, and drive the Mustang during the week. I absolutely love this Ranger! I've owned the large F150's; great trucks, but this ranger impresses me.
Hopefully someone who has pressed their 3.0 can give you the top speed information your looking for.