I have converted two ka24e MPI engines to carburetor. I used a 1978 - 1979 ford 2.3L engine carbs that I got a deal on from a local auto parts store that was closing. They are Holley two barrel two stage carb. I had to install a fuel regulator to lower the pressure to about 8lbs. The fuel regulator needs to be a three port style, there are ways to use a two port(which is what I did) just more work. The stock fuel pump is being used. I made adapter plates, kind of like a high rise intake. I bolted it on to the stock intake manifold. I left the injectors right in there. One took a little tweaking and the second ran good from the beginning.
I converted both of them to vacuum dizzy. Thanks to California Datsun , they have the distributor stand that needs to be installed that they sell with the matchbox style distributor. The installation is a a drill and tap the timing chain cover for the stand. Ebay had both of the oil pump shafts one was an L20b engine most preferred. The Second was was from the 240z engine. The ignition was set to 12 degrees. There is a power gain and worth the swap. I would like to add pics, not sure how to do it yet.