I have a pretty basic system made by FiTech, the GoEFI4 it's supposed to be able to support up to 600 HP, I have a little more than half that... When I bought it FiTech was offering a $100 rebate so $999 minus $100.... But then you need a high pressure fuel system, lots of ways to do that, I chose to copy what the OE's did with a pump mounted in the tank... Tank & Pump was just under $500, I also had various fittings & two new 3/8"s steel lines front to back.... Total install I have between $17-1800 into....
FWIW if you poke around the internet looking for info on the FiTech system you'll find some people have had problems, most are running FiTech's "Command center" which is the quick easy way to do a high pressure fuel system that doesn't require a new tank or lines, it all stays under the hood..... Some guys get away with it, I wasn't going to take the chance..... If that option interests you consider the Robb MC Powersurge, it's the same concept but it actually seems to work.... Anyway photos....