It sounds like you are not in the USA where this message board is located, what country are you in?

" the original ignition needs injections signal ? "

The original ignition for a M104 is built into the injection computer. I am not sure about the M103

" what parts and how many integrate the original ignition ? "

It would depend on what engine you select.

" what is the gm ignition ?, distributor, coil, module, harness, crank trigger, which car ? "

GM = General Motors, a common auto maker in the USA. What brand os ignition you select depends on what is sold in your country.

" If I need to build and adapt ignition, I believe m104 and edis will be better option. ? "

M 104 would probably be the best choice because it is newer and you may be more likely to find a good used one.

"do you know a place to buy this engines ? used low miles, rebuilt ?"

No