If you have never done an ECA stack before, I would start out at 25mg of ephedrine twice a day. Once you get used to it you can up your dose to 50mg. Also, if sleeping is important to you, don't take it to late in the day or you'll be up all night. When I stack, I'll do 50 to 75mg twice a day. First dose when I wake up and second dose no later than 2:00pm, any later and I'm up all night. Just stick to 25mg for awhile to you get used to it.
Yes, it's a very good stack. It works very well for me at 25mg of ephedrine, 200mg of caffiene (most caffiene tabs come in this strength anyway) and a baby asprin (81mg). I would not recommend full strength asprin 2 or 3 times a day. It can be quite harsh on your stomach.