64 dart convert to EFI

Any of these aftermarket EFI systems are somewhat "universal." They are not brand/ model specific. There are ? at least 2 ? hp levels of the Holley, you just need to get the smaller 4bbl one I think "up to" 600hp. UNLIKE a carb, an EFI cannot really have a "too large" throttle body, because it does not use vacuum signals in the body (carb) to control fuel. The only downside of getting a "too large" system would be too large injectors. You will have to "do something" about fuel as well. Many use an inline Walbro pump, I've forgotten what model. The EFI systems all need higher pressures for fuel than a carb. Go to the Holley support site and do some reading Go to Youtube and do some looking. ESPECIALLY for Holley, there is TONS AND TONS of "DIY" info.