I have seen several Schiada's with blown and turbo EFI motors. EFI is slick and I was planning on doing it on my next v-drive, but you either have to re-learn how to tune (if you tune your own stuff) or pay someone with the proper knowledge and tools to do it for you. If you have a comfortable understanding of how EFI works, you shouldn't have any trouble.
Just remember that EFI can leave you out on the water with a part failure, that you probably can't replace at Autozone in a pinch....