The IE heads are the same as far as bolting up the carbies is concerned. The only difference is the IE inlet manifolds have injector bosses cast in. This shouldn't be an issue though.
I am in the process of a conversion which is the exact opposite. I am converting the 1.7 carby motor in my Sud to IE.
With a few modifications of course. I am keeping my carby heads and cams, as well as the dizzy. The carby motors have higher compression, wilder cams (more duration and lift) and a different dizzy curve. I am just adding the IE induction system, effectively. There is no reason why this motor shouldn't make just as much power as the carbs. The IE system is very well designed, and should make adding a turbo later on, if I want to go down that path, much easier. I am going to mod the L-JET airflow meter to provide a richer mixture, which should work well with the carby cams. New injectors aren't expensive either, same as a Hyundai Excel!
With the sale of the 40IDFs on eBay too, I am sure I will well cover the cost of the IE gear. I may even make a profit
