I have a Weber Alpha Ignition ECU for a silvertop zetec for sale. This is complete with loom and has a map already installed to get you running. This is the best way to get a mappable ignition system and would be ideal for someone running DCOEs (I also have a spare set of these lying around) or bike carb's.

Description copied from Burton Power:-

Product Description.A state of the art 2D electronic ignition system featuring an ignition map of 16 RPM sites that can be upgraded to full 3D ignition management by the addition of a throttle position sensor (16 RPM x 16 engine load sites). The system features an engine speed limiter, and there is also a tachometer output drive and a gearshift lamp drive. Engine specific systems are supplied calibrated for a standard specification engine. Each kit includes: ECU, wiring harness, inlet air temperature sensor and cable ties. . ECU, WIRING, AIR TEMP SENSOR & FITTING PARTS

http://www.burtonpower.com/parts-by-fitment-type/parts-by-engine-ford/ford-zetec-e/webk97017.html

The loom was fitted to the car but not the ECU, changed my mind.

Burton have this for sale for £458, I'm looking for £250 ono.