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As for me !! ..... Going to have a crack at running the Zetec with the stock ECU & re-worked inlet manifold. Mainly just for the challenge & in the full knowledge that this is probably not the best performance option
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The stock ECU should be fine for getting the engine going. The only potential issue is that if you have significantly changed the intake/exhaust system, you may start to run lean. That should be easy enough to sort with an adjustable pressure regulator and a Lambda
Generally, you don't tend to see massive power increases between carbs and efi - what you see is better power across the range. I.e. because you have limited adjustment within the carb, you often have to sacrifice some areas of the power curve to give you max power. EFI lets you tune the whole of the power curve - the correct term i suppose to use is improved driveability - i.e. more power low down while maintaing top end performance.
I've been lucky enough to have had the chance in a previous job to spend a couple of years playing with DTA and Motec ECUs on a proper engine dyno. Interesting that about 90% of time was spent messsing with the setup rather than actually mapping. Electrical gremlins are a nightmare - cause more problems than anything else. Then you often found that the most basic setup was not done with care - sensor relations, throttle balancing etc. It always surprises how few people run a lambda sensor.I am going to try one of these units -
http://wbo2.com/2y/default.htm and see how it goes.I have the problem of being spoilt and having had all the toys before that someone else had paid for!!!