Holley dominator all the way. Tons of online support and lots of people runnig them. Myself and a friend got my Engine up and running very quickly (an hour) once everything was plugged up correctly. It really is amazing how easy it is to use. Plus it is self tunning. With that said an OEM computer is fine to use. with the use of HPtuners and a tuner there isn't a whole lot you can't do with an OEM ecu