Marelli management is bizzare, and needs a 4 tooth pickup wheel. You could modify the flywheel for this, but it's easier to mod a crank pulley. The fiesta efi system is capable of providing much more accurate timing information with its 36-1 wheels.

Marelli also has only one spark output, so needs an ancient dizzy. Stu does a board that allows you to drive a modern coil pack, defo worth while if u are going to the trouble of marelli.