Efi
Going from a carb to EFI, Thottle body injection would have to be the easiest and cheapest way to go. Tuned port is ok, but the tuned port runners are only really designed to work with the cam the engine came with and it's power is limited. With throttle body injction, you can keep the intake manifold you have already, and all that's left is a minimal amount of wiring anf fuel delivery upgrades. If you REALLY want fancy-schmancy, go with a sequential port fuel injection, but be prepared to spend 2G's +.