You can buy a 3g hemi ,wire it , and tune it for the cost of this setup which is less tha 2k with a 90mm throttle body included for a third of the cost , please tell me how thats about $700. I am talking about someone that is starting out with no electronics.
and the ezi efi isn't all that great yet you are much better off running the full xfi system that includes the ignition box and throttle body for around $2995 but plan on spending 1000 to get it tuned since they have to write the tune from scratch.