I don't know about getting rid of ecu altogether an going edis, as it needs something to advance retard the timing, and I was under the impression edis was merely the amp combo, needing still advance retard to be calculated and signalled.
40's power would depend on what size chokes they have, as these are changeable, but usually around 80% of the carb size so 90% of 40 would be 32 in each side(throat) of the carbs, but can go bigger.
Cams can/will give more power with the right fuelling, but do as you say alter the point at which the power is produced.
A car I was watching yesterday on the rollers, a nice mk2 cortina running a V6 cossie lump, whose engine was made/put together by a "pro engine builder"(not owner) had 4 cams all timed up wrong, lift on overlap was 10 50 5 210+, amazingly it still did 176.6, but no more with the way the cams were, the owners going to have a "chat" with the engine builder!!
As said the EGR should not affect power, it is used to reduce the combustion chamber temperature, nothing at all to do with economy, it is used to stop the NoX emmissions as these occur when chamber temps get high enough and are particularly nasty, recycling gas actually helps cool the chamber down.
If you do blank off/remove the EGR, just don't throw the exhaust gas pressure differential sensor, as on some ecu's this puts it into LOS mode, it still needs to be plugged in, even though not doing anything.
tabetha