requirements for 3stage vtec head swap ona D15b3 carb engine

Hey Guys. I have an Eg with a D15b3 engine fitted. I've been wanting to get a D15b 3stage engine from the states or canada for a while now but the costs in getting it to south africa are enormous. Recently I was able to locate a guy who says he has the 3stage head for sale. The head is complete and he's willing to give me a d16a6 fuel injection intake with throttle, no fuel raill and injectors though.
With that said I'd like to know what else I would need to do the swap as well as would it be worth it. What codes should I look out for on the head and the intake. Any info would be highly appreciated. Thanks in advance
With that said I'd like to know what else I would need to do the swap as well as would it be worth it. What codes should I look out for on the head and the intake. Any info would be highly appreciated. Thanks in advance