what is involved with adding a mode c to a IV with a 583 Blue Head. I understand the engine driven system/generator may not be able to handle it.

And then there is Nexgen and 2020 and ADS-B "out" mode S WAAS (automatic dependent surveillance broadcast system)

for now I just want to get a mode c going and see what happens in 4 years.
BTW I know a lot about Nexgen as I just finished my CFI re-currency training if anybody wants the skinny.