Thomas, the reason I post the stuff I do is in case anyone wants to try it. The casting stuff is pretty straightforward but requires a lot of equipment. The EFI doesn't need too much except you need to come up with a trigger wheel. The issue is that there is a steep learning curve. You can buy some of the parts like the control board, etc, but then you need to get a throttle body somehow mated with your engine. I imagine that I will eventually cast the throttle body to reed housing adapter in aluminum but, for now, will use the 3D printed part. The throttle body that came with the kit has a built in intake air sensor, manifold pressure sensor, and throttle position sensor. Because there was no documentation, I only use the TPS and that was fun trying to figure out which wires to use. The thing is sealed up so I had to do some detective work. I have a lab grade power supply that I used to put 5 volts into the thing and watched the remaining wires while I moved the throttle.
I could go on but I should get back to work.