Sounds like you could make EFI work so it just comes down to the investment vs. the reward. If you like to tinker and tune then EFI can be rewarding. Between the digital control of the tune and the feedback from the data logger you can adjust the tune until the car is doing exactly what you want. But in your case you're going to have spend money twice since you already have a carb and a distributor. The wiring will need to be redone and you'll need to change the plumbing and maybe the fuel tank.
